16636200771

Committed 30 Jul 2025 11:46PM UTC coverage: 44.271% (-2.0%) from 46.31%

Build # 16636200771

Build Type

Pull #2626

github

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web-flow

Commit Message

Merge bfd339d18 into c0a7c02a0

Pull Request Pull Request #2626: core: flush after each Log* line

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237 of 350 new or added lines in 32 files covered. (67.71%)

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59.33

/src/mavsdk/core/mavlink_parameter_client.cpp

#include "mavlink_parameter_helper.h"
#include "mavlink_parameter_client.h"
#include "mavlink_message_handler.h"
#include "system_impl.h"
#include "overloaded.h"
#include <algorithm>
#include <future>
#include <limits>
#include <utility>

namespace mavsdk {

MavlinkParameterClient::MavlinkParameterClient(
    Sender& sender,
    MavlinkMessageHandler& message_handler,
    TimeoutHandler& timeout_handler,
    TimeoutSCallback timeout_s_callback,
    AutopilotCallback autopilot_callback,
    uint8_t target_system_id,
    uint8_t target_component_id,
    bool use_extended) :
    _sender(sender),
    _message_handler(message_handler),
    _timeout_handler(timeout_handler),
    _timeout_s_callback(std::move(timeout_s_callback)),
    _autopilot_callback(std::move(autopilot_callback)),
    _target_system_id(target_system_id),
    _target_component_id(target_component_id),
    _use_extended(use_extended)
{
    if (const char* env_p = std::getenv("MAVSDK_PARAMETER_DEBUGGING")) {
        if (std::string(env_p) == "1") {
            LogDebug() << "Parameter debugging is on.";
            _parameter_debugging = true;
        }
    }

    if (_parameter_debugging) {
        LogDebug() << "MavlinkParameterClient created for target compid: "
                   << (int)_target_component_id << " and "
                   << (_use_extended ? "extended" : "not extended");
    }

    if (_use_extended) {
        _message_handler.register_one(
            MAVLINK_MSG_ID_PARAM_EXT_VALUE,
            [this](const mavlink_message_t& message) { process_param_ext_value(message); },
            this);

        _message_handler.register_one(
            MAVLINK_MSG_ID_PARAM_EXT_ACK,
            [this](const mavlink_message_t& message) { process_param_ext_ack(message); },
            this);
    } else {
        _message_handler.register_one(
            MAVLINK_MSG_ID_PARAM_VALUE,
            [this](const mavlink_message_t& message) { process_param_value(message); },
            this);
    }
}

MavlinkParameterClient::~MavlinkParameterClient()
{
    if (_parameter_debugging) {
        LogDebug() << "MavlinkParameterClient destructed for target compid: "
                   << (int)_target_component_id << " and "
                   << (_use_extended ? "extended" : "not extended");
    }

    _message_handler.unregister_all(this);
}

MavlinkParameterClient::Result
MavlinkParameterClient::set_param(const std::string& name, const ParamValue& value)
{
    auto prom = std::promise<Result>();
    auto res = prom.get_future();
    set_param_async(name, value, [&prom](Result result) { prom.set_value(result); }, this);
    return res.get();
}

void MavlinkParameterClient::set_param_async(
    const std::string& name,
    const ParamValue& value,
    const SetParamCallback& callback,
    const void* cookie)
{
    if (name.size() > PARAM_ID_LEN) {
        LogErr() << "Param name too long";
        if (callback) {
            callback(Result::ParamNameTooLong);
        }
        return;
    }
    if (value.is<std::string>() && !_use_extended) {
        LogErr() << "String needs extended parameter protocol";
        if (callback) {
            callback(Result::StringTypeUnsupported);
        }
        return;
    }
    auto new_work = std::make_shared<WorkItem>(WorkItemSet{name, value, callback}, cookie);
    _work_queue.push_back(new_work);
}

void MavlinkParameterClient::set_param_int_async(
    const std::string& name, int32_t value, const SetParamCallback& callback, const void* cookie)
{
    if (name.size() > PARAM_ID_LEN) {
        LogErr() << "Param name too long";
        if (callback) {
            callback(Result::ParamNameTooLong);
        }
        return;
    }

    // PX4 only uses int32_t, so we can be sure and don't need to check the exact type first
    // by getting the param, or checking the cache.
    if (_autopilot_callback() == Autopilot::Px4) {
        ParamValue value_to_set;
        value_to_set.set(static_cast<int32_t>(value));
        set_param_async(name, value_to_set, callback, cookie);
    } else {
        // We don't know which exact int type the server wants, so we have to get the param
        // first to see the type before setting it.
        auto param_opt = _param_cache.param_by_id(name, false);
        if (param_opt.has_value()) {
            // we have the parameter cached
            auto param = param_opt.value();
            if (param.value.set_int(value)) {
                // we have successfully written whatever int the user provided into the int type
                // that is actually stored
                set_param_async(name, param.value, callback, cookie);
            } else {
                // We didn't find compatibility and give up.
                LogErr() << "Wrong type for int in cache";
                if (callback) {
                    callback(Result::WrongType);
                }
                return;
            }
        } else {
            // parameter is not cached. Request it and then perform the appropriate action once we
            // know it
            auto send_message_once_type_is_known = [this, name, value, callback, cookie](
                                                       Result result,
                                                       ParamValue fetched_param_value) {
                if (result == Result::Success) {
                    if (fetched_param_value.set_int(value)) {
                        // Since the callback itself is called with the work queue locked, we have
                        // to make sure that the work queue guard is removed before we call the
                        // finalizing callback of a work item.
                        set_param_async(name, fetched_param_value, callback, cookie);
                    } else {
                        // The param type returned does is not compatible with an int, give up.
                        LogErr() << "Wrong type for int returned";
                        if (callback) {
                            callback(Result::WrongType);
                        }
                    }
                } else {
                    // Failed to get the param to get the type, pass on the error.
                    callback(result);
                }
            };
            get_param_async(name, send_message_once_type_is_known, cookie);
        }
    }
}

MavlinkParameterClient::Result
MavlinkParameterClient::set_param_int(const std::string& name, int32_t value)
{
    auto prom = std::promise<Result>();
    auto res = prom.get_future();
    set_param_int_async(name, value, [&prom](Result result) { prom.set_value(result); }, this);
    return res.get();
}

void MavlinkParameterClient::set_param_float_async(
    const std::string& name, float value, const SetParamCallback& callback, const void* cookie)
{
    ParamValue value_to_set;
    value_to_set.set_float(value);
    set_param_async(name, value_to_set, callback, cookie);
}

MavlinkParameterClient::Result
MavlinkParameterClient::set_param_float(const std::string& name, float value)
{
    auto prom = std::promise<Result>();
    auto res = prom.get_future();

    set_param_float_async(name, value, [&prom](Result result) { prom.set_value(result); }, this);

    return res.get();
}

void MavlinkParameterClient::set_param_custom_async(
    const std::string& name,
    const std::string& value,
    const SetParamCallback& callback,
    const void* cookie)
{
    if (name.size() > PARAM_ID_LEN) {
        LogErr() << "Param name too long";
        if (callback) {
            callback(Result::ParamNameTooLong);
        }
        return;
    }

    if (value.size() > sizeof(mavlink_param_ext_set_t::param_value)) {
        LogErr() << "Param value too long";
        if (callback) {
            callback(Result::ParamValueTooLong);
        }
        return;
    }
    ParamValue value_to_set;
    value_to_set.set_custom(value);
    set_param_async(name, value_to_set, callback, cookie);
}

MavlinkParameterClient::Result
MavlinkParameterClient::set_param_custom(const std::string& name, const std::string& value)
{
    auto prom = std::promise<Result>();
    auto res = prom.get_future();
    set_param_custom_async(name, value, [&prom](Result result) { prom.set_value(result); }, this);
    return res.get();
}

void MavlinkParameterClient::get_param_async(
    const std::string& name, const GetParamAnyCallback& callback, const void* cookie)
{
    if (_parameter_debugging) {
        LogDebug() << "Getting param " << name << ", extended: " << (_use_extended ? "yes" : "no");
    }
    if (name.size() > PARAM_ID_LEN) {
        LogErr() << "Param name too long";
        if (callback) {
            callback(Result::ParamNameTooLong, {});
        }
        return;
    }

    auto new_work = std::make_shared<WorkItem>(WorkItemGet{name, callback}, cookie);
    _work_queue.push_back(new_work);
}

void MavlinkParameterClient::get_param_async(
    const std::string& name,
    const ParamValue& value_type,
    const GetParamAnyCallback& callback,
    const void* cookie)
{
    // We need to delay the type checking until we get a response from the server.
    GetParamAnyCallback callback_future_result = [callback,
                                                  value_type](Result result, ParamValue value) {
        if (result == Result::Success) {
            if (value.is_same_type(value_type)) {
                callback(Result::Success, std::move(value));
            } else {
                callback(Result::WrongType, {});
            }
        } else {
            callback(result, {});
        }
    };
    get_param_async(name, callback_future_result, cookie);
}

template<class T>
void MavlinkParameterClient::get_param_async_typesafe(
    const std::string& name, const GetParamTypesafeCallback<T> callback, const void* cookie)
{
    // We need to delay the type checking until we get a response from the server.
    GetParamAnyCallback callback_future_result = [callback](Result result, ParamValue value) {
        if (result == Result::Success) {
            if (value.is<T>()) {
                callback(Result::Success, value.get<T>());
            } else {
                callback(Result::WrongType, {});
            }
        } else {
            callback(result, {});
        }
    };
    get_param_async(name, callback_future_result, cookie);
}

template<>
void MavlinkParameterClient::get_param_async_typesafe(
    const std::string& name, const GetParamTypesafeCallback<int32_t> callback, const void* cookie)
{
    // We need to delay the type checking until we get a response from the server.
    GetParamAnyCallback callback_future_result = [callback](Result result, ParamValue value) {
        if (result == Result::Success) {
            if (value.is<int32_t>()) {
                callback(Result::Success, value.get<int32_t>());
            } else if (value.is<int16_t>()) {
                callback(Result::Success, value.get<int16_t>());
            } else if (value.is<int8_t>()) {
                callback(Result::Success, value.get<int8_t>());
            } else {
                callback(Result::WrongType, {});
            }
        } else {
            callback(result, {});
        }
    };
    get_param_async(name, callback_future_result, cookie);
}

void MavlinkParameterClient::get_param_float_async(
    const std::string& name, const GetParamFloatCallback& callback, const void* cookie)
{
    get_param_async_typesafe<float>(name, callback, cookie);
}

void MavlinkParameterClient::get_param_int_async(
    const std::string& name, const GetParamIntCallback& callback, const void* cookie)
{
    get_param_async_typesafe<int32_t>(name, callback, cookie);
}

void MavlinkParameterClient::get_param_custom_async(
    const std::string& name, const GetParamCustomCallback& callback, const void* cookie)
{
    get_param_async_typesafe<std::string>(name, callback, cookie);
}

std::pair<MavlinkParameterClient::Result, ParamValue>
MavlinkParameterClient::get_param(const std::string& name)
{
    auto prom = std::promise<std::pair<Result, ParamValue>>();
    auto res = prom.get_future();
    get_param_async(
        name,
        [&prom](Result result, ParamValue new_value) {
            prom.set_value(std::make_pair<>(result, std::move(new_value)));
        },
        this);
    return res.get();
}

std::pair<MavlinkParameterClient::Result, int32_t>
MavlinkParameterClient::get_param_int(const std::string& name)
{
    auto prom = std::promise<std::pair<Result, int32_t>>();
    auto res = prom.get_future();
    get_param_int_async(
        name,
        [&prom](Result result, int32_t value) { prom.set_value(std::make_pair<>(result, value)); },
        this);
    return res.get();
}

std::pair<MavlinkParameterClient::Result, float>
MavlinkParameterClient::get_param_float(const std::string& name)
{
    auto prom = std::promise<std::pair<Result, float>>();
    auto res = prom.get_future();

    // Store addresses for corruption detection
    void* prom_addr = &prom;
    void* fut_addr = &res;

    LogInfo() << "Parameter get_param_float('" << name << "') - prom: " << prom_addr
              << " fut: " << fut_addr;

    get_param_float_async(
        name,
        [&prom, prom_addr, fut_addr, name](Result result, float value) {
            LogInfo() << "Parameter callback for '" << name << "' - prom: " << &prom
                      << " (orig: " << prom_addr << ") result: " << (int)result;

            if (&prom != prom_addr) {
                LogErr() << "CORRUPTION DETECTED: Promise address changed from " << prom_addr
                         << " to " << &prom;
                std::abort();
            }

            prom.set_value(std::make_pair<>(result, value));
            LogInfo() << "Promise set_value completed for '" << name << "'";
        },
        this);

    LogInfo() << "About to call fut.get() for '" << name << "'";
    auto result = res.get();
    LogInfo() << "fut.get() returned for '" << name << "' - result: " << (int)result.first;

    return result;
}

std::pair<MavlinkParameterClient::Result, std::string>
MavlinkParameterClient::get_param_custom(const std::string& name)
{
    auto prom = std::promise<std::pair<Result, std::string>>();
    auto res = prom.get_future();
    get_param_custom_async(
        name,
        [&prom](Result result, const std::string& value) {
            prom.set_value(std::make_pair<>(result, value));
        },
        this);
    return res.get();
}

void MavlinkParameterClient::get_all_params_async(GetAllParamsCallback callback, void* cookie)
{
    if (_parameter_debugging) {
        LogDebug() << "Getting all params, extended: " << (_use_extended ? "yes" : "no");
    }

    auto new_work =
        std::make_shared<WorkItem>(WorkItemGetAll{std::move(callback), 0, false}, cookie);
    _work_queue.push_back(new_work);
}

std::pair<MavlinkParameterClient::Result, std::map<std::string, ParamValue>>
MavlinkParameterClient::get_all_params()
{
    std::promise<std::pair<MavlinkParameterClient::Result, std::map<std::string, ParamValue>>> prom;
    auto res = prom.get_future();
    get_all_params_async(
        // Make sure to NOT use a reference for all_params here, pass by value.
        // Since for example on a timeout, the empty all_params result is constructed in-place and
        // then goes out of scope when the callback returns.
        [&prom](Result result, std::map<std::string, ParamValue> set) {
            prom.set_value({result, std::move(set)});
        },
        this);
    auto ret = res.get();
    return ret;
}

void MavlinkParameterClient::cancel_all_param(const void* cookie)
{
    LockedQueue<WorkItem>::Guard work_queue_guard(_work_queue);

    // We don't call any callbacks before erasing them as this is just used on destruction
    // where we don't care anymore.
    _work_queue.erase(std::remove_if(_work_queue.begin(), _work_queue.end(), [&](auto&& item) {
        return (item->cookie == cookie);
    }));
}

void MavlinkParameterClient::clear_cache()
{
    _param_cache.clear();
}

void MavlinkParameterClient::do_work()
{
    auto work_queue_guard = std::make_unique<LockedQueue<WorkItem>::Guard>(_work_queue);
    auto work = work_queue_guard->get_front();

    if (!work) {
        return;
    }

    if (work->already_requested) {
        return;
    }

    std::visit(
        overloaded{
            [&](WorkItemSet& item) {
                if (!send_set_param_message(item)) {
                    LogErr() << "Send message failed";
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(Result::ConnectionError);
                    }
                    return;
                }
                work->already_requested = true;
                // We want to get notified if a timeout happens
                _timeout_cookie =
                    _timeout_handler.add([this] { receive_timeout(); }, _timeout_s_callback());
            },
            [&](WorkItemGet& item) {
                // We can't rely on the cache as we haven't implemented the hash check.
                clear_cache();
                if (!send_get_param_message(item)) {
                    LogErr() << "Send message failed";
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(Result::ConnectionError, ParamValue{});
                    }
                    return;
                }
                work->already_requested = true;
                // We want to get notified if a timeout happens
                _timeout_cookie =
                    _timeout_handler.add([this] { receive_timeout(); }, _timeout_s_callback());
            },
            [&](WorkItemGetAll& item) {
                // We can't rely on the cache as we haven't implemented the hash check.
                clear_cache();
                if (!send_request_list_message()) {
                    LogErr() << "Send message failed";
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(Result::ConnectionError, {});
                    }
                    return;
                }
                work->already_requested = true;
                // We want to get notified if a timeout happens
                _timeout_cookie = _timeout_handler.add(
                    [this] { receive_timeout(); }, _timeout_s_callback() * _get_all_timeout_factor);
            }},
        work->work_item_variant);
}

bool MavlinkParameterClient::send_set_param_message(WorkItemSet& work_item)
{
    auto param_id = param_id_to_message_buffer(work_item.param_name);

    mavlink_message_t message;
    if (_use_extended) {
        const auto param_value_buf = work_item.param_value.get_128_bytes();
        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Sending param_ext_set from:" << (int)mavlink_address.system_id << '/'
                           << (int)mavlink_address.component_id << " to: " << (int)_target_system_id
                           << '/' << (int)_target_component_id;
            }

            mavlink_msg_param_ext_set_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id,
                param_id.data(),
                param_value_buf.data(),
                work_item.param_value.get_mav_param_ext_type());

            return message;
        });
    } else {
        const float value_set = (_autopilot_callback() == Autopilot::ArduPilot) ?
                                    work_item.param_value.get_4_float_bytes_cast() :
                                    work_item.param_value.get_4_float_bytes_bytewise();

        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Sending param_set from:" << (int)mavlink_address.system_id << '/'
                           << (int)mavlink_address.component_id << " to: " << (int)_target_system_id
                           << '/' << (int)_target_component_id;
            }
            mavlink_msg_param_set_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id,
                param_id.data(),
                value_set,
                work_item.param_value.get_mav_param_type());
            return message;
        });
    }
}

bool MavlinkParameterClient::send_get_param_message(WorkItemGet& work_item)
{
    std::array<char, PARAM_ID_LEN> param_id_buff{};
    int16_t param_index = -1;
    if (auto str = std::get_if<std::string>(&work_item.param_identifier)) {
        param_id_buff = param_id_to_message_buffer(*str);
    } else {
        // param_id_buff doesn't matter
        param_index = std::get<int16_t>(work_item.param_identifier);
    }

    return send_get_param_message(param_id_buff, param_index);
}

bool MavlinkParameterClient::send_get_param_message(
    const std::array<char, PARAM_ID_LEN>& param_id_buff, int16_t param_index)
{
    mavlink_message_t message;

    if (_use_extended) {
        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Send param_ext_request_read: " << (int)mavlink_address.system_id
                           << ":" << (int)mavlink_address.component_id << " to "
                           << (int)_target_system_id << ":" << (int)_target_component_id;
            }
            mavlink_msg_param_ext_request_read_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id,
                param_id_buff.data(),
                param_index);
            return message;
        });

    } else {
        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Send param_request_read: " << (int)mavlink_address.system_id << ":"
                           << (int)mavlink_address.component_id << " to " << (int)_target_system_id
                           << ":" << (int)_target_component_id;
            }
            mavlink_msg_param_request_read_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id,
                param_id_buff.data(),
                param_index);
            return message;
        });
    }
}

bool MavlinkParameterClient::send_request_list_message()
{
    if (_use_extended) {
        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Sending param_ext_request_list to:" << (int)mavlink_address.system_id
                           << ":" << (int)mavlink_address.component_id;
            }
            mavlink_message_t message;
            mavlink_msg_param_ext_request_list_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id);
            return message;
        });
    } else {
        return _sender.queue_message([&](MavlinkAddress mavlink_address, uint8_t channel) {
            if (_parameter_debugging) {
                LogDebug() << "Sending param_request_list to:" << (int)mavlink_address.system_id
                           << ":" << (int)mavlink_address.component_id;
            }
            mavlink_message_t message;
            mavlink_msg_param_request_list_pack_chan(
                mavlink_address.system_id,
                mavlink_address.component_id,
                channel,
                &message,
                _target_system_id,
                _target_component_id);
            return message;
        });
    }
}

void MavlinkParameterClient::process_param_value(const mavlink_message_t& message)
{
    mavlink_param_value_t param_value;
    mavlink_msg_param_value_decode(&message, &param_value);
    const std::string safe_param_id = extract_safe_param_id(param_value.param_id);
    if (safe_param_id.empty()) {
        LogWarn() << "Got ill-formed param_value message (param_id empty)";
        return;
    }

    ParamValue received_value;
    const bool set_value_success = received_value.set_from_mavlink_param_value(
        param_value,
        (_autopilot_callback() == Autopilot::ArduPilot) ? ParamValue::Conversion::Cast :
                                                          ParamValue::Conversion::Bitwise);
    if (!set_value_success) {
        LogWarn() << "Got ill-formed param_ext_value message (param_type unknown)";
        return;
    }

    if (_parameter_debugging) {
        LogDebug() << "process_param_value: " << safe_param_id << " " << received_value
                   << ", index: " << param_value.param_index;
    }

    if (param_value.param_index == std::numeric_limits<uint16_t>::max() &&
        safe_param_id == "_HASH_CHECK") {
        // Ignore PX4's _HASH_CHECK param.
        return;
    }

    // We need to use a unique pointer here to remove the lock from the work queue manually "early"
    // before calling the (perhaps user-provided) callback. Otherwise, we might end up in a deadlock
    // if the callback wants to push another work item onto the queue. By using a unique ptr there
    // is no risk of forgetting to remove the lock - it is destroyed (if still valid) after going
    // out of scope.
    auto work_queue_guard = std::make_unique<LockedQueue<WorkItem>::Guard>(_work_queue);
    const auto work = work_queue_guard->get_front();

    if (!work) {
        // Prevent deadlock by releasing the lock before doing more work.
        work_queue_guard.reset();
        // update existing param
        find_and_call_subscriptions_value_changed(safe_param_id, received_value);
        return;
    }

    if (!work->already_requested) {
        return;
    }

    std::visit(
        overloaded{
            [&](WorkItemSet& item) {
                if (item.param_name != safe_param_id) {
                    // No match, let's just return the borrowed work item.
                    return;
                }

                if (_parameter_debugging) {
                    LogDebug() << "Item value is: " << item.param_value
                               << ", received: " << received_value;
                }

                if (!item.param_value.is_same_type(received_value)) {
                    LogErr() << "Wrong type in param set";
                    _timeout_handler.remove(_timeout_cookie);
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(MavlinkParameterClient::Result::WrongType);
                    }
                    return;
                }

                if (item.param_value == received_value) {
                    // This was successful. Inform the caller.
                    _timeout_handler.remove(_timeout_cookie);
                    // LogDebug() << "time taken: " <<
                    // _sender.get_time().elapsed_since_s(_last_request_time);
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(MavlinkParameterClient::Result::Success);
                    }
                } else {
                    // We might be receiving stale param_value messages, let's just
                    // try again. This can happen if the timeout is chosen low and we
                    // get out of sync when doing a param_get just before the param_set.
                    // In that case we have stale param_value messages in flux and
                    // receive them here.
                    if (work->retries_to_do > 0) {
                        LogWarn() << "sending again, retries to do: " << work->retries_to_do
                                  << "  (" << item.param_name << ").";

                        if (!send_set_param_message(item)) {
                            LogErr() << "connection send error in retransmit (" << item.param_name
                                     << ").";
                            work_queue_guard->pop_front();

                            if (item.callback) {
                                auto callback = item.callback;
                                work_queue_guard.reset();
                                callback(Result::ConnectionError);
                            }
                            _timeout_handler.refresh(_timeout_cookie);
                        } else {
                            --work->retries_to_do;
                            _timeout_handler.refresh(_timeout_cookie);
                        }
                    } else {
                        // We have tried retransmitting, giving up now.
                        LogErr() << "Error: Retrying failed set param failed: " << item.param_name;
                        work_queue_guard->pop_front();
                        if (item.callback) {
                            auto callback = item.callback;
                            work_queue_guard.reset();
                            callback(Result::Timeout);
                        }
                    }
                }
            },
            [&](WorkItemGet& item) {
                if (!validate_id_or_index(
                        item.param_identifier,
                        safe_param_id,
                        static_cast<int16_t>(param_value.param_index))) {
                    LogWarn() << "Got unexpected response on work item";
                    // No match, let's just return the borrowed work item.
                    return;
                }
                _timeout_handler.remove(_timeout_cookie);
                // LogDebug() << "time taken: " <<
                // _sender.get_time().elapsed_since_s(_last_request_time);
                work_queue_guard->pop_front();
                if (item.callback) {
                    auto callback = item.callback;
                    work_queue_guard.reset();
                    callback(Result::Success, received_value);
                }
            },
            [&](WorkItemGetAll& item) {
                auto maybe_current_missing_index = _param_cache.last_missing_requested();

                switch (_param_cache.add_new_param(
                    safe_param_id, received_value, param_value.param_index)) {
                    case MavlinkParameterCache::AddNewParamResult::AlreadyExists:
                        // FALLTHROUGH
                        // We don't care if it already exists, just overwrite it and carry on.
                        // The reason is that this can likely happen if the very first
                        // request_list is sent twice and hence we get a bunch of duplicate
                        // params.
                    case MavlinkParameterCache::AddNewParamResult::Ok:

                        if (item.count != param_value.param_count) {
                            item.count = param_value.param_count;
                            if (_parameter_debugging) {
                                LogDebug() << "Count is now " << item.count;
                            }
                        }

                        if (_parameter_debugging) {
                            LogDebug() << "Received param: " << param_value.param_index;
                        }

                        if (_param_cache.count(_use_extended) == param_value.param_count) {
                            _timeout_handler.remove(_timeout_cookie);
                            if (_parameter_debugging) {
                                LogDebug() << "Getting all parameters complete: "
                                           << (_use_extended ? "extended" : "not extended");
                            }
                            work_queue_guard->pop_front();
                            if (item.callback) {
                                auto callback = item.callback;
                                work_queue_guard.reset();
                                callback(
                                    Result::Success,
                                    _param_cache.all_parameters_map(_use_extended));
                            }
                        } else {
                            if (_parameter_debugging) {
                                LogDebug() << "Received " << _param_cache.count(_use_extended)
                                           << " of " << param_value.param_count;
                            }
                            if (item.rerequesting) {
                                if (maybe_current_missing_index == param_value.param_index) {
                                    // Looks like the last one of the previous retransmission chunk
                                    // was done, start another one.
                                    if (!request_next_missing(item.count)) {
                                        work_queue_guard->pop_front();
                                        if (item.callback) {
                                            auto callback = item.callback;
                                            work_queue_guard.reset();
                                            callback(Result::ConnectionError, {});
                                        }
                                        return;
                                    }
                                }
                            } else {
                                // update the timeout handler, messages are still coming in.
                            }
                            _timeout_handler.refresh(_timeout_cookie);
                        }
                        break;
                    case MavlinkParameterCache::AddNewParamResult::TooManyParams:
                        // We shouldn't be able to get here as the incoming type is only an
                        // uint16_t.
                        LogErr() << "Too many params received";
                        assert(false);
                        break;
                    default:
                        LogErr() << "Unknown AddNewParamResult";
                        assert(false);
                        break;
                }
            }},
        work->work_item_variant);
}

void MavlinkParameterClient::process_param_ext_value(const mavlink_message_t& message)
{
    mavlink_param_ext_value_t param_ext_value;
    mavlink_msg_param_ext_value_decode(&message, &param_ext_value);
    const auto safe_param_id = extract_safe_param_id(param_ext_value.param_id);
    if (safe_param_id.empty()) {
        LogWarn() << "Got ill-formed param_ext_value message (param_id empty)";
        return;
    }
    ParamValue received_value;
    if (!received_value.set_from_mavlink_param_ext_value(param_ext_value)) {
        LogWarn() << "Got ill-formed param_ext_value message (param_type unknown)";
        return;
    }

    if (_parameter_debugging) {
        LogDebug() << "process param_ext_value: " << safe_param_id << " " << received_value;
    }

    // See comments on process_param_value for use of unique_ptr
    auto work_queue_guard = std::make_unique<LockedQueue<WorkItem>::Guard>(_work_queue);
    auto work = work_queue_guard->get_front();

    if (!work) {
        // Prevent deadlock by releasing the lock before doing more work.
        work_queue_guard.reset();
        // update existing param
        find_and_call_subscriptions_value_changed(safe_param_id, received_value);
        return;
    }

    if (!work->already_requested) {
        return;
    }

    std::visit(
        overloaded{
            [&](WorkItemSet&) {
                if (_parameter_debugging) {
                    LogDebug() << "Unexpected ParamExtValue response.";
                }
            },
            [&](WorkItemGet& item) {
                if (!validate_id_or_index(
                        item.param_identifier,
                        safe_param_id,
                        static_cast<int16_t>(param_ext_value.param_index))) {
                    LogWarn() << "Got unexpected response on work item";
                    // No match, let's just return the borrowed work item.
                    return;
                }
                _timeout_handler.remove(_timeout_cookie);
                // LogDebug() << "time taken: " <<
                // _sender.get_time().elapsed_since_s(_last_request_time);
                work_queue_guard->pop_front();
                if (item.callback) {
                    auto callback = item.callback;
                    work_queue_guard.reset();
                    callback(Result::Success, received_value);
                }
            },
            [&](WorkItemGetAll& item) {
                switch (_param_cache.add_new_param(
                    safe_param_id, received_value, param_ext_value.param_index)) {
                    case MavlinkParameterCache::AddNewParamResult::AlreadyExists:
                        // PASSTHROUGH.
                    case MavlinkParameterCache::AddNewParamResult::Ok:
                        item.count = param_ext_value.param_count;
                        if (_parameter_debugging) {
                            LogDebug() << "Count is now " << item.count;
                        }

                        if (_param_cache.count(_use_extended) == param_ext_value.param_count) {
                            _timeout_handler.remove(_timeout_cookie);
                            if (_parameter_debugging) {
                                LogDebug() << "Getting all parameters complete: "
                                           << (_use_extended ? "extended" : "not extended");
                            }
                            work_queue_guard->pop_front();
                            if (item.callback) {
                                auto callback = item.callback;
                                work_queue_guard.reset();
                                callback(
                                    Result::Success,
                                    _param_cache.all_parameters_map(_use_extended));
                            }
                        } else {
                            if (_parameter_debugging) {
                                LogDebug() << "Received " << _param_cache.count(_use_extended)
                                           << " of " << param_ext_value.param_count;
                            }
                            // update the timeout handler, messages are still coming in.
                            _timeout_handler.refresh(_timeout_cookie);
                        }
                        break;
                    case MavlinkParameterCache::AddNewParamResult::TooManyParams:
                        // We shouldn't be able to get here as the incoming type is only an
                        // uint16_t.
                        LogErr() << "Too many params received";
                        assert(false);
                        break;
                    default:
                        LogErr() << "Unknown AddNewParamResult";
                        assert(false);
                        break;
                }
            },
        },
        work->work_item_variant);
}

void MavlinkParameterClient::process_param_ext_ack(const mavlink_message_t& message)
{
    mavlink_param_ext_ack_t param_ext_ack;
    mavlink_msg_param_ext_ack_decode(&message, &param_ext_ack);
    const auto safe_param_id = extract_safe_param_id(param_ext_ack.param_id);

    if (_parameter_debugging) {
        LogDebug() << "process param_ext_ack: " << safe_param_id << " "
                   << (int)param_ext_ack.param_result;
    }

    // See comments on process_param_value for use of unique_ptr
    auto work_queue_guard = std::make_unique<LockedQueue<WorkItem>::Guard>(_work_queue);
    auto work = work_queue_guard->get_front();
    if (!work) {
        return;
    }
    if (!work->already_requested) {
        return;
    }

    std::visit(
        overloaded{
            [&](WorkItemSet& item) {
                if (item.param_name != safe_param_id) {
                    // No match, let's just return the borrowed work item.
                    return;
                }
                if (param_ext_ack.param_result == PARAM_ACK_ACCEPTED) {
                    _timeout_handler.remove(_timeout_cookie);
                    // LogDebug() << "time taken: " <<
                    // _sender.get_time().elapsed_since_s(_last_request_time);
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        // We are done, inform caller and go back to idle
                        work_queue_guard.reset();
                        callback(Result::Success);
                    }
                } else if (param_ext_ack.param_result == PARAM_ACK_IN_PROGRESS) {
                    // Reset timeout and wait again.
                    _timeout_handler.refresh(_timeout_cookie);

                } else {
                    LogWarn() << "Somehow we did not get an ack, we got: "
                              << int(param_ext_ack.param_result);
                    _timeout_handler.remove(_timeout_cookie);
                    // LogDebug() << "time taken: " <<
                    // _sender.get_time().elapsed_since_s(_last_request_time);
                    work_queue_guard->pop_front();
                    work_queue_guard.reset();
                    if (item.callback) {
                        auto callback = item.callback;
                        auto result = [&]() {
                            switch (param_ext_ack.param_result) {
                                case PARAM_ACK_FAILED:
                                    return Result::Failed;
                                case PARAM_ACK_VALUE_UNSUPPORTED:
                                    return Result::ValueUnsupported;
                                default:
                                    return Result::UnknownError;
                            }
                        }();
                        work_queue_guard.reset();
                        callback(result);
                    }
                }
            },
            [&](WorkItemGet&) { LogWarn() << "Unexpected ParamExtAck response."; },
            [&](WorkItemGetAll&) { LogWarn() << "Unexpected ParamExtAck response."; }},
        work->work_item_variant);
}

void MavlinkParameterClient::receive_timeout()
{
    // See comments on process_param_value for use of unique_ptr
    auto work_queue_guard = std::make_unique<LockedQueue<WorkItem>::Guard>(_work_queue);

    auto work = work_queue_guard->get_front();
    if (!work) {
        LogErr() << "Received timeout without work";
        return;
    }
    if (!work->already_requested) {
        LogErr() << "Received timeout without already having work requested";
        return;
    }

    std::visit(
        overloaded{
            [&](WorkItemSet& item) {
                if (work->retries_to_do > 0) {
                    // We're not sure the command arrived, let's retransmit.
                    LogWarn() << "sending again, retries to do: " << work->retries_to_do << "  ("
                              << item.param_name << ").";

                    if (!send_set_param_message(item)) {
                        LogErr() << "connection send error in retransmit (" << item.param_name
                                 << ").";
                        work_queue_guard->pop_front();

                        if (item.callback) {
                            auto callback = item.callback;
                            work_queue_guard.reset();
                            callback(Result::ConnectionError);
                        }
                    } else {
                        --work->retries_to_do;
                        _timeout_cookie = _timeout_handler.add(
                            [this] { receive_timeout(); }, _timeout_s_callback());
                    }
                } else {
                    // We have tried retransmitting, giving up now.
                    LogErr() << "Error: Retrying failed set param timeout: " << item.param_name;
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(Result::Timeout);
                    }
                }
            },
            [&](WorkItemGet& item) {
                if (work->retries_to_do > 0) {
                    // We're not sure the command arrived, let's retransmit.
                    LogWarn() << "sending again, retries to do: " << work->retries_to_do;
                    if (!send_get_param_message(item)) {
                        LogErr() << "connection send error in retransmit ";
                        work_queue_guard->pop_front();
                        if (item.callback) {
                            auto callback = item.callback;
                            work_queue_guard.reset();
                            callback(Result::ConnectionError, {});
                        }
                    } else {
                        --work->retries_to_do;
                        _timeout_cookie = _timeout_handler.add(
                            [this] { receive_timeout(); }, _timeout_s_callback());
                    }
                } else {
                    // We have tried retransmitting, giving up now.
                    LogErr() << "retrying failed";
                    work_queue_guard->pop_front();
                    if (item.callback) {
                        auto callback = item.callback;
                        work_queue_guard.reset();
                        callback(Result::Timeout, {});
                    }
                }
            },
            [&](WorkItemGetAll& item) {
                // Request missing parameters.
                // If retries are exceeded, give up with timeout.

                if (_parameter_debugging) {
                    LogDebug() << "All params receive timeout with";
                }

                if (item.count == 0) {
                    // We got 0 messages back from the server (param count unknown). Most likely the
                    // "list request" got lost before making it to the server,
                    if (work->retries_to_do > 0) {
                        --work->retries_to_do;

                        if (!send_request_list_message()) {
                            LogErr() << "Send message failed";
                            work_queue_guard->pop_front();
                            if (item.callback) {
                                auto callback = item.callback;
                                work_queue_guard.reset();
                                callback(Result::ConnectionError, {});
                            }
                            return;
                        }

                        // We want to get notified if a timeout happens.
                        _timeout_cookie = _timeout_handler.add(
                            [this] { receive_timeout(); },
                            _timeout_s_callback() * _get_all_timeout_factor);
                    } else {
                        if (item.callback) {
                            auto callback = item.callback;
                            work_queue_guard.reset();
                            callback(Result::Timeout, {});
                        }
                        return;
                    }

                } else {
                    item.rerequesting = true;

                    LogInfo() << "Requesting " << _param_cache.missing_count(item.count) << " of "
                              << item.count << " parameters missed during initial burst.";

                    if (_parameter_debugging) {
                        _param_cache.print_missing(item.count);
                    }

                    // To speed retransmissions up, we request params in chunks, otherwise the
                    // latency back and forth makes this quite slow.
                    if (!request_next_missing(item.count)) {
                        work_queue_guard->pop_front();
                        if (item.callback) {
                            auto callback = item.callback;
                            work_queue_guard.reset();
                            callback(Result::ConnectionError, {});
                        }
                        return;
                    }

                    _timeout_cookie =
                        _timeout_handler.add([this] { receive_timeout(); }, _timeout_s_callback());
                }
            }},
        work->work_item_variant);
}

bool MavlinkParameterClient::request_next_missing(uint16_t count)
{
    // Requesting 10 at a time seems to work on SiK radios.
    const uint16_t chunk_size = 10;

    auto next_missing_indices = _param_cache.next_missing_indices(count, chunk_size);
    if (next_missing_indices.empty()) {
        LogErr() << "logic error, there should a missing index";
        return false;
    }

    for (auto next_missing_index : next_missing_indices) {
        if (_parameter_debugging) {
            LogDebug() << "Requesting missing parameter " << (int)next_missing_index;
        }

        std::array<char, PARAM_ID_LEN> param_id_buff{};

        if (!send_get_param_message(param_id_buff, next_missing_index)) {
            LogErr() << "Send message failed";
            return false;
        }
    }
    return true;
}

std::ostream& operator<<(std::ostream& str, const MavlinkParameterClient::Result& result)
{
    switch (result) {
        case MavlinkParameterClient::Result::Success:
            return str << "Success";
        case MavlinkParameterClient::Result::Timeout:
            return str << "Timeout";
        case MavlinkParameterClient::Result::ConnectionError:
            return str << "ConnectionError";
        case MavlinkParameterClient::Result::WrongType:
            return str << "WrongType";
        case MavlinkParameterClient::Result::ParamNameTooLong:
            return str << "ParamNameTooLong";
        case MavlinkParameterClient::Result::NotFound:
            return str << "NotFound";
        case MavlinkParameterClient::Result::ValueUnsupported:
            return str << "ValueUnsupported";
        case MavlinkParameterClient::Result::Failed:
            return str << "Failed";
        case MavlinkParameterClient::Result::UnknownError:
            // Fallthrough
        default:
            return str << "UnknownError";
    }
}

bool MavlinkParameterClient::validate_id_or_index(
    const std::variant<std::string, int16_t>& original,
    const std::string& param_id,
    const int16_t param_index)
{
    if (const auto str = std::get_if<std::string>(&original)) {
        if (param_id != *str) {
            // We requested by string id, but response doesn't match
            return false;
        }
    } else {
        const auto tmp = std::get<int16_t>(original);
        if (param_index != tmp) {
            // We requested by index, but response doesn't match
            return false;
        }
    }
    return true;
}

} // namespace mavsdk

mavlink / MAVSDK / 16636200771

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