param.cpp

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/*
 * Copyright 2014,2015,2016 Vladimir Ermakov.
 *
 * This file is part of the mavros package and subject to the license terms
 * in the top-level LICENSE file of the mavros repository.
 * https://github.com/mavlink/mavros/tree/master/LICENSE.md
 */

#include <chrono>
#include <condition_variable>
#include <mavros/mavros_plugin.h>

#include <mavros_msgs/ParamSet.h>
#include <mavros_msgs/ParamGet.h>
#include <mavros_msgs/ParamPull.h>
#include <mavros_msgs/ParamPush.h>
#include <mavros_msgs/Param.h>

namespace mavros {
namespace std_plugins {
using utils::enum_value;

class Parameter {
public:
        using MT = mavlink::common::MAV_PARAM_TYPE;
        using PARAM_SET = mavlink::common::msg::PARAM_SET;
        using XmlRpcValue = XmlRpc::XmlRpcValue;

        std::string param_id;
        XmlRpcValue param_value;
        uint16_t param_index;
        uint16_t param_count;

        void set_value(mavlink::common::msg::PARAM_VALUE &pmsg)
        {
                mavlink::mavlink_param_union_t uv;
                uv.param_float = pmsg.param_value;

                // #170 - copy union value to itermediate var
                int int_tmp;
                float float_tmp;

                switch (pmsg.param_type) {
                // [[[cog:
                // param_types = [ (s, 'float' if s == 'real32' else s) for s in (
                //     'int8', 'uint8',
                //     'int16', 'uint16',
                //     'int32', 'uint32',
                //     'real32',
                // )]
                // unsupported_types = ('int64', 'uint64', 'real64')
                //
                // for a, b in param_types:
                //     btype = 'int' if 'int' in b else b
                //     cog.outl("case enum_value(MT::%s):" % a.upper())
                //     cog.outl("\t%s_tmp = uv.param_%s;" % (btype, b))
                //     cog.outl("\tparam_value = %s_tmp;" % btype)
                //     cog.outl("\tbreak;")
                // ]]]
                case enum_value(MT::INT8):
                        int_tmp = uv.param_int8;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT8):
                        int_tmp = uv.param_uint8;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::INT16):
                        int_tmp = uv.param_int16;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT16):
                        int_tmp = uv.param_uint16;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::INT32):
                        int_tmp = uv.param_int32;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT32):
                        int_tmp = uv.param_uint32;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::REAL32):
                        float_tmp = uv.param_float;
                        param_value = float_tmp;
                        break;
                // [[[end]]] (checksum: 5950e4ee032d4aa198b953f56909e129)

                default:
                        ROS_WARN_NAMED("param", "PM: Unsupported param %.16s (%u/%u) type: %u",
                                        pmsg.param_id.data(), pmsg.param_index, pmsg.param_count, pmsg.param_type);
                        param_value = 0;
                };
        }

        void set_value_apm_quirk(mavlink::common::msg::PARAM_VALUE &pmsg)
        {
                int32_t int_tmp;
                float float_tmp;

                switch (pmsg.param_type) {
                // [[[cog:
                // for a, b in param_types:
                //     btype = 'int' if 'int' in b else b
                //     cog.outl("case enum_value(MT::%s):" % a.upper())
                //     cog.outl("\t%s_tmp = pmsg.param_value;" % btype)
                //     cog.outl("\tparam_value = %s_tmp;" % btype)
                //     cog.outl("\tbreak;")
                // ]]]
                case enum_value(MT::INT8):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT8):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::INT16):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT16):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::INT32):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::UINT32):
                        int_tmp = pmsg.param_value;
                        param_value = int_tmp;
                        break;
                case enum_value(MT::REAL32):
                        float_tmp = pmsg.param_value;
                        param_value = float_tmp;
                        break;
                // [[[end]]] (checksum: c30ee34dd84213471690612ab49f1f73)

                default:
                        ROS_WARN_NAMED("param", "PM: Unsupported param %.16s (%u/%u) type: %u",
                                        pmsg.param_id.data(), pmsg.param_index, pmsg.param_count, pmsg.param_type);
                        param_value = 0;
                }
        }

        PARAM_SET to_param_set()
        {
                // Note: XmlRpcValue does not have const cast operators.
                //       This method can't be const.

                mavlink::mavlink_param_union_t uv;
                PARAM_SET ret{};

                mavlink::set_string(ret.param_id, param_id);

                switch (param_value.getType()) {
                // [[[cog:
                // xmlrpc_types = (
                //     ('TypeBoolean', 'uint8', 'bool'),
                //     ('TypeInt', 'int32', 'int32_t'),
                //     ('TypeDouble', 'real32', 'double'),
                // )
                //
                // for a, b, c in xmlrpc_types:
                //     uvb = 'float' if 'real32' == b else b
                //     cog.outl("case XmlRpcValue::%s:" % a)
                //     cog.outl("\tuv.param_%s = static_cast<%s>(param_value);" % (uvb, c))
                //     cog.outl("\tret.param_type = enum_value(MT::%s);" % b.upper())
                //     cog.outl("\tbreak;")
                // ]]]
                case XmlRpcValue::TypeBoolean:
                        uv.param_uint8 = static_cast<bool>(param_value);
                        ret.param_type = enum_value(MT::UINT8);
                        break;
                case XmlRpcValue::TypeInt:
                        uv.param_int32 = static_cast<int32_t>(param_value);
                        ret.param_type = enum_value(MT::INT32);
                        break;
                case XmlRpcValue::TypeDouble:
                        uv.param_float = static_cast<double>(param_value);
                        ret.param_type = enum_value(MT::REAL32);
                        break;
                // [[[end]]] (checksum: c414a3950fba234cbbe694a2576ae022)

                default:
                        ROS_WARN_NAMED("param", "PR: Unsupported XmlRpcValue type: %u", param_value.getType());
                }

                ret.param_value = uv.param_float;
                return ret;
        }

        PARAM_SET to_param_set_apm_qurk()
        {
                PARAM_SET ret{};

                mavlink::set_string(ret.param_id, param_id);

                switch (param_value.getType()) {
                // [[[cog:
                // for a, b, c in xmlrpc_types:
                //     cog.outl("case XmlRpcValue::%s:" % a)
                //     cog.outl("\tret.param_value = static_cast<%s &>(param_value);" % c)
                //     cog.outl("\tret.param_type = enum_value(MT::%s);" % b.upper())
                //     cog.outl("\tbreak;")
                // ]]]
                case XmlRpcValue::TypeBoolean:
                        ret.param_value = static_cast<bool &>(param_value);
                        ret.param_type = enum_value(MT::UINT8);
                        break;
                case XmlRpcValue::TypeInt:
                        ret.param_value = static_cast<int32_t &>(param_value);
                        ret.param_type = enum_value(MT::INT32);
                        break;
                case XmlRpcValue::TypeDouble:
                        ret.param_value = static_cast<double &>(param_value);
                        ret.param_type = enum_value(MT::REAL32);
                        break;
                // [[[end]]] (checksum: 5b10c0e1f2e916f1c31313eaa5cc83e0)

                default:
                        ROS_WARN_NAMED("param", "PR: Unsupported XmlRpcValue type: %u", param_value.getType());
                }

                return ret;
        }

        int64_t to_integer()
        {
                switch (param_value.getType()) {
                // [[[cog:
                // for a, b, c in xmlrpc_types:
                //    if 'int' not in b:
                //       continue
                //    cog.outl("case XmlRpcValue::%s:\treturn static_cast<%s>(param_value);" % (a, c))
                // ]]]
                case XmlRpcValue::TypeBoolean:  return static_cast<bool>(param_value);
                case XmlRpcValue::TypeInt:      return static_cast<int32_t>(param_value);
                // [[[end]]] (checksum: ce23a3bc04354d8cfcb82341beb83709)

                default:
                        return 0;
                }
        }

        double to_real()
        {
                if (param_value.getType() == XmlRpcValue::TypeDouble)
                        return static_cast<double>(param_value);
                else
                        return 0.0;
        }

        // for debugging
        std::string to_string() const
        {
                return utils::format("%s (%u/%u): %s", param_id.c_str(), param_index, param_count, param_value.toXml().c_str());
        }

        mavros_msgs::Param to_msg()
        {
                mavros_msgs::Param msg;

                // XXX(vooon): find better solution
                msg.header.stamp = ros::Time::now();

                msg.param_id = param_id;
                msg.value.integer = to_integer();
                msg.value.real = to_real();
                msg.param_index = param_index;
                msg.param_count = param_count;

                return msg;
        }

        static bool check_exclude_param_id(std::string param_id)
        {
                return param_id == "SYSID_SW_MREV"     ||
                       param_id == "SYS_NUM_RESETS"    ||
                       param_id == "ARSPD_OFFSET"      ||
                       param_id == "GND_ABS_PRESS"     ||
                       param_id == "GND_ABS_PRESS2"    ||
                       param_id == "GND_ABS_PRESS3"    ||
                       param_id == "STAT_BOOTCNT"      ||
                       param_id == "STAT_FLTTIME"      ||
                       param_id == "STAT_RESET"        ||
                       param_id == "STAT_RUNTIME"      ||
                       param_id == "GND_TEMP"          ||
                       param_id == "CMD_TOTAL"         ||
                       param_id == "CMD_INDEX"         ||
                       param_id == "LOG_LASTFILE"      ||
                       param_id == "FENCE_TOTAL"       ||
                       param_id == "FORMAT_VERSION";
        }
};


class ParamSetOpt {
public:
        ParamSetOpt(Parameter &_p, size_t _rem) :
                param(_p),
                retries_remaining(_rem),
                is_timedout(false)
        { }

        Parameter param;
        size_t retries_remaining;
        bool is_timedout;
        std::mutex cond_mutex;
        std::condition_variable ack;
};


class ParamPlugin : public plugin::PluginBase {
public:
        ParamPlugin() : PluginBase(),
                param_nh("~param"),
                BOOTUP_TIME_DT(BOOTUP_TIME_MS / 1000.0),
                LIST_TIMEOUT_DT(LIST_TIMEOUT_MS / 1000.0),
                PARAM_TIMEOUT_DT(PARAM_TIMEOUT_MS / 1000.0),
                RETRIES_COUNT(_RETRIES_COUNT),
                param_count(-1),
                param_state(PR::IDLE),
                param_rx_retries(RETRIES_COUNT),
                is_timedout(false)
        { }

        void initialize(UAS &uas_) override
        {
                PluginBase::initialize(uas_);

                pull_srv = param_nh.advertiseService("pull", &ParamPlugin::pull_cb, this);
                push_srv = param_nh.advertiseService("push", &ParamPlugin::push_cb, this);
                set_srv = param_nh.advertiseService("set", &ParamPlugin::set_cb, this);
                get_srv = param_nh.advertiseService("get", &ParamPlugin::get_cb, this);

                param_value_pub = param_nh.advertise<mavros_msgs::Param>("param_value", 100);

                shedule_timer = param_nh.createTimer(BOOTUP_TIME_DT, &ParamPlugin::shedule_cb, this, true);
                shedule_timer.stop();
                timeout_timer = param_nh.createTimer(PARAM_TIMEOUT_DT, &ParamPlugin::timeout_cb, this, true);
                timeout_timer.stop();
                enable_connection_cb();
        }

        Subscriptions get_subscriptions() override
        {
                return {
                        make_handler(&ParamPlugin::handle_param_value),
                };
        }

private:
        using lock_guard = std::lock_guard<std::recursive_mutex>;
        using unique_lock = std::unique_lock<std::recursive_mutex>;

        std::recursive_mutex mutex;
        ros::NodeHandle param_nh;

        ros::ServiceServer pull_srv;
        ros::ServiceServer push_srv;
        ros::ServiceServer set_srv;
        ros::ServiceServer get_srv;

        ros::Publisher param_value_pub;

        ros::Timer shedule_timer;                       
        ros::Timer timeout_timer;                       

        static constexpr int BOOTUP_TIME_MS = 10000;    
        static constexpr int PARAM_TIMEOUT_MS = 1000;   
        static constexpr int LIST_TIMEOUT_MS = 30000;   
        static constexpr int _RETRIES_COUNT = 3;

        const ros::Duration BOOTUP_TIME_DT;
        const ros::Duration LIST_TIMEOUT_DT;
        const ros::Duration PARAM_TIMEOUT_DT;
        const int RETRIES_COUNT;

        std::unordered_map<std::string, Parameter> parameters;
        std::list<uint16_t> parameters_missing_idx;
        std::unordered_map<std::string, std::shared_ptr<ParamSetOpt>> set_parameters;
        ssize_t param_count;
        enum class PR {
                IDLE,
                RXLIST,
                RXPARAM,
                RXPARAM_TIMEDOUT,
                TXPARAM
        };
        PR param_state;

        size_t param_rx_retries;
        bool is_timedout;
        std::mutex list_cond_mutex;
        std::condition_variable list_receiving;

        /* -*- message handlers -*- */

        void handle_param_value(const mavlink::mavlink_message_t *msg, mavlink::common::msg::PARAM_VALUE &pmsg)
        {
                lock_guard lock(mutex);

                auto param_id = mavlink::to_string(pmsg.param_id);

                // search
                auto param_it = parameters.find(param_id);
                if (param_it != parameters.end()) {
                        // parameter exists
                        auto &p = param_it->second;

                        if (m_uas->is_ardupilotmega())
                                p.set_value_apm_quirk(pmsg);
                        else
                                p.set_value(pmsg);

                        // check that ack required
                        auto set_it = set_parameters.find(param_id);
                        if (set_it != set_parameters.end()) {
                                set_it->second->ack.notify_all();
                        }

                        param_value_pub.publish(p.to_msg());

                        ROS_WARN_STREAM_COND_NAMED(
                                        ((p.param_index != pmsg.param_index &&
                                          pmsg.param_index != UINT16_MAX) ||
                                         p.param_count != pmsg.param_count),
                                        "param",
                                        "PR: Param " << p.to_string() << " different index: " << pmsg.param_index << "/" << pmsg.param_count);
                        ROS_DEBUG_STREAM_NAMED("param", "PR: Update param " << p.to_string());
                }
                else {
                        // insert new element
                        Parameter p{};
                        p.param_id = param_id;
                        p.param_index = pmsg.param_index;
                        p.param_count = pmsg.param_count;

                        if (m_uas->is_ardupilotmega())
                                p.set_value_apm_quirk(pmsg);
                        else
                                p.set_value(pmsg);

                        parameters[param_id] = p;

                        param_value_pub.publish(p.to_msg());

                        ROS_DEBUG_STREAM_NAMED("param", "PR: New param " << p.to_string());
                }

                if (param_state == PR::RXLIST || param_state == PR::RXPARAM || param_state == PR::RXPARAM_TIMEDOUT) {

                        // we received first param. setup list timeout
                        if (param_state == PR::RXLIST) {
                                param_count = pmsg.param_count;
                                param_state = PR::RXPARAM;

                                parameters_missing_idx.clear();
                                if (param_count != UINT16_MAX) {
                                        ROS_DEBUG_NAMED("param", "PR: waiting %zu parameters", param_count);
                                        // declare that all parameters are missing
                                        for (uint16_t idx = 0; idx < param_count; idx++)
                                                parameters_missing_idx.push_back(idx);
                                }
                                else
                                        ROS_WARN_NAMED("param", "PR: FCU does not know index for first element! "
                                                        "Param list may be truncated.");
                        }

                        // trying to avoid endless rerequest loop
                        // Issue #276
                        bool it_is_first_requested = parameters_missing_idx.front() == pmsg.param_index;

                        // remove idx for that message
                        parameters_missing_idx.remove(pmsg.param_index);

                        // in receiving mode we use param_rx_retries for LIST and PARAM
                        if (it_is_first_requested) {
                                ROS_DEBUG_NAMED("param", "PR: got a value of a requested param idx=%u, "
                                                "resetting retries count", pmsg.param_index);
                                param_rx_retries = RETRIES_COUNT;
                        } else if (param_state == PR::RXPARAM_TIMEDOUT) {
                                ROS_INFO_NAMED("param", "PR: got an unsolicited param value idx=%u, "
                                                "not resetting retries count %zu", pmsg.param_index, param_rx_retries);
                        }

                        restart_timeout_timer();

                        /* index starting from 0, receivig done */
                        if (parameters_missing_idx.empty()) {
                                ssize_t missed = param_count - parameters.size();
                                ROS_INFO_COND_NAMED(missed == 0, "param", "PR: parameters list received");
                                ROS_WARN_COND_NAMED(missed > 0, "param",
                                                "PR: parameters list received, but %zd parametars are missed",
                                                missed);
                                go_idle();
                                list_receiving.notify_all();
                        } else if (param_state == PR::RXPARAM_TIMEDOUT) {
                                uint16_t first_miss_idx = parameters_missing_idx.front();
                                ROS_DEBUG_NAMED("param", "PR: requesting next timed out parameter idx=%u", first_miss_idx);
                                param_request_read("", first_miss_idx);
                        }
                }
        }

        /* -*- low-level send function -*- */

        void param_request_list()
        {
                ROS_DEBUG_NAMED("param", "PR:m: request list");

                mavlink::common::msg::PARAM_REQUEST_LIST rql{};
                m_uas->msg_set_target(rql);

                UAS_FCU(m_uas)->send_message_ignore_drop(rql);
        }

        void param_request_read(std::string id, int16_t index = -1)
        {
                ROS_ASSERT(index >= -1);

                ROS_DEBUG_NAMED("param", "PR:m: request '%s', idx %d", id.c_str(), index);

                mavlink::common::msg::PARAM_REQUEST_READ rqr{};
                m_uas->msg_set_target(rqr);
                rqr.param_index = index;

                if (index != -1) {
                        mavlink::set_string(rqr.param_id, id);
                }

                UAS_FCU(m_uas)->send_message_ignore_drop(rqr);
        }

        void param_set(Parameter &param)
        {
                ROS_DEBUG_STREAM_NAMED("param", "PR:m: set param " << param.to_string());

                // GCC 4.8 can't type out lambda return
                auto ps = ([this, &param]() -> mavlink::common::msg::PARAM_SET {
                        if (m_uas->is_ardupilotmega())
                                return param.to_param_set_apm_qurk();
                        else
                                return param.to_param_set();
                })();

                m_uas->msg_set_target(ps);

                UAS_FCU(m_uas)->send_message_ignore_drop(ps);
        }

        /* -*- mid-level functions -*- */

        void connection_cb(bool connected) override
        {
                lock_guard lock(mutex);
                if (connected) {
                        shedule_pull(BOOTUP_TIME_DT);
                }
                else {
                        shedule_timer.stop();
                }
        }

        void shedule_pull(const ros::Duration &dt)
        {
                shedule_timer.stop();
                shedule_timer.setPeriod(dt);
                shedule_timer.start();
        }

        void shedule_cb(const ros::TimerEvent &event)
        {
                lock_guard lock(mutex);
                if (param_state != PR::IDLE) {
                        // try later
                        ROS_DEBUG_NAMED("param", "PR: busy, reshedule pull");
                        shedule_pull(BOOTUP_TIME_DT);
                }

                ROS_DEBUG_NAMED("param", "PR: start sheduled pull");
                param_state = PR::RXLIST;
                param_rx_retries = RETRIES_COUNT;
                parameters.clear();

                restart_timeout_timer();
                param_request_list();
        }

        void timeout_cb(const ros::TimerEvent &event)
        {
                lock_guard lock(mutex);
                if (param_state == PR::RXLIST && param_rx_retries > 0) {
                        param_rx_retries--;
                        ROS_WARN_NAMED("param", "PR: request list timeout, retries left %zu", param_rx_retries);

                        restart_timeout_timer();
                        param_request_list();
                }
                else if (param_state == PR::RXPARAM || param_state == PR::RXPARAM_TIMEDOUT) {
                        if (parameters_missing_idx.empty()) {
                                ROS_WARN_NAMED("param", "PR: missing list is clear, but we in RXPARAM state, "
                                                "maybe last rerequest fails. Params missed: %zd",
                                                param_count - parameters.size());
                                go_idle();
                                list_receiving.notify_all();
                                return;
                        }

                        param_state = PR::RXPARAM_TIMEDOUT;
                        uint16_t first_miss_idx = parameters_missing_idx.front();
                        if (param_rx_retries > 0) {
                                param_rx_retries--;
                                ROS_WARN_NAMED("param", "PR: request param #%u timeout, retries left %zu, and %zu params still missing",
                                                first_miss_idx, param_rx_retries, parameters_missing_idx.size());
                                restart_timeout_timer();
                                param_request_read("", first_miss_idx);
                        }
                        else {
                                ROS_ERROR_NAMED("param", "PR: request param #%u completely missing.", first_miss_idx);
                                parameters_missing_idx.pop_front();
                                restart_timeout_timer();
                                if (!parameters_missing_idx.empty()) {
                                        param_rx_retries = RETRIES_COUNT;
                                        first_miss_idx = parameters_missing_idx.front();

                                        ROS_WARN_NAMED("param", "PR: %zu params still missing, trying to request next: #%u",
                                                        parameters_missing_idx.size(), first_miss_idx);
                                        param_request_read("", first_miss_idx);
                                }
                        }
                }
                else if (param_state == PR::TXPARAM) {
                        auto it = set_parameters.begin();
                        if (it == set_parameters.end()) {
                                ROS_DEBUG_NAMED("param", "PR: send list empty, but state TXPARAM");
                                go_idle();
                                return;
                        }

                        if (it->second->retries_remaining > 0) {
                                it->second->retries_remaining--;
                                ROS_WARN_NAMED("param", "PR: Resend param set for %s, retries left %zu",
                                                it->second->param.param_id.c_str(),
                                                it->second->retries_remaining);
                                restart_timeout_timer();
                                param_set(it->second->param);
                        }
                        else {
                                ROS_ERROR_NAMED("param", "PR: Param set for %s timed out.",
                                                it->second->param.param_id.c_str());
                                it->second->is_timedout = true;
                                it->second->ack.notify_all();
                        }
                }
                else {
                        ROS_DEBUG_NAMED("param", "PR: timeout in IDLE!");
                }
        }

        void restart_timeout_timer()
        {
                is_timedout = false;
                timeout_timer.stop();
                timeout_timer.start();
        }

        void go_idle()
        {
                param_state = PR::IDLE;
                timeout_timer.stop();
        }

        bool wait_fetch_all()
        {
                std::unique_lock<std::mutex> lock(list_cond_mutex);

                return list_receiving.wait_for(lock, std::chrono::nanoseconds(LIST_TIMEOUT_DT.toNSec()))
                       == std::cv_status::no_timeout
                       && !is_timedout;
        }

        bool wait_param_set_ack_for(std::shared_ptr<ParamSetOpt> opt)
        {
                std::unique_lock<std::mutex> lock(opt->cond_mutex);

                return opt->ack.wait_for(lock, std::chrono::nanoseconds(PARAM_TIMEOUT_DT.toNSec()) * (RETRIES_COUNT + 2))
                       == std::cv_status::no_timeout
                       && !opt->is_timedout;
        }

        bool send_param_set_and_wait(Parameter &param)
        {
                unique_lock lock(mutex);

                // add to waiting list
                auto opt = std::make_shared<ParamSetOpt>(param, RETRIES_COUNT);
                set_parameters[param.param_id] = opt;

                param_state = PR::TXPARAM;
                restart_timeout_timer();
                param_set(param);

                lock.unlock();
                bool is_not_timeout = wait_param_set_ack_for(opt);
                lock.lock();

                // free opt data
                set_parameters.erase(param.param_id);

                go_idle();
                return is_not_timeout;
        }

        bool rosparam_set_allowed(const Parameter &p)
        {
                if (m_uas->is_px4() && p.param_id == "_HASH_CHECK") {
                        auto v = p.param_value; // const XmlRpcValue can't cast
                        ROS_INFO_NAMED("param", "PR: PX4 parameter _HASH_CHECK ignored: 0x%8x", static_cast<int32_t>(v));
                        return false;
                }

                param_nh.setParam(p.param_id, p.param_value);
                return true;
        }

        /* -*- ROS callbacks -*- */

        bool pull_cb(mavros_msgs::ParamPull::Request &req,
                        mavros_msgs::ParamPull::Response &res)
        {
                unique_lock lock(mutex);

                if ((param_state == PR::IDLE && parameters.empty())
                                || req.force_pull) {
                        if (!req.force_pull)
                                ROS_DEBUG_NAMED("param", "PR: start pull");
                        else
                                ROS_INFO_NAMED("param", "PR: start force pull");

                        param_state = PR::RXLIST;
                        param_rx_retries = RETRIES_COUNT;
                        parameters.clear();

                        shedule_timer.stop();
                        restart_timeout_timer();
                        param_request_list();

                        lock.unlock();
                        res.success = wait_fetch_all();
                }
                else if (param_state == PR::RXLIST || param_state == PR::RXPARAM || param_state == PR::RXPARAM_TIMEDOUT) {
                        lock.unlock();
                        res.success = wait_fetch_all();
                }
                else {
                        lock.unlock();
                        res.success = true;
                }

                lock.lock();
                res.param_received = parameters.size();

                for (auto p : parameters) {
                        lock.unlock();
                        rosparam_set_allowed(p.second);
                        lock.lock();
                }

                return true;
        }

        bool push_cb(mavros_msgs::ParamPush::Request &req,
                        mavros_msgs::ParamPush::Response &res)
        {
                XmlRpc::XmlRpcValue param_dict;
                if (!param_nh.getParam("", param_dict))
                        return true;

                ROS_ASSERT(param_dict.getType() == XmlRpc::XmlRpcValue::TypeStruct);

                int tx_count = 0;
                for (auto &param : param_dict) {
                        if (Parameter::check_exclude_param_id(param.first)) {
                                ROS_DEBUG_STREAM_NAMED("param", "PR: Exclude param: " << param.first);
                                continue;
                        }

                        unique_lock lock(mutex);
                        auto param_it = parameters.find(param.first);
                        if (param_it != parameters.end()) {
                                // copy current state of Parameter
                                auto to_send = param_it->second;

                                // Update XmlRpcValue
                                to_send.param_value = param.second;

                                lock.unlock();
                                bool set_res = send_param_set_and_wait(to_send);
                                lock.lock();

                                if (set_res)
                                        tx_count++;
                        }
                        else {
                                ROS_WARN_STREAM_NAMED("param", "PR: Unknown rosparam: " << param.first);
                        }
                }

                res.success = true;
                res.param_transfered = tx_count;

                return true;
        }

        bool set_cb(mavros_msgs::ParamSet::Request &req,
                        mavros_msgs::ParamSet::Response &res)
        {
                unique_lock lock(mutex);

                if (param_state == PR::RXLIST || param_state == PR::RXPARAM || param_state == PR::RXPARAM_TIMEDOUT) {
                        ROS_ERROR_NAMED("param", "PR: receiving not complete");
                        return false;
                }

                auto param_it = parameters.find(req.param_id);
                if (param_it != parameters.end()) {
                        auto to_send = param_it->second;

                        // according to ParamValue description
                        if (req.value.integer != 0)
                                to_send.param_value = static_cast<int>(req.value.integer);
                        else if (req.value.real != 0.0)
                                to_send.param_value = req.value.real;
                        else if (param_it->second.param_value.getType() == XmlRpc::XmlRpcValue::Type::TypeDouble)
                                to_send.param_value = req.value.real;
                        else
                                to_send.param_value = 0;

                        lock.unlock();
                        res.success = send_param_set_and_wait(to_send);
                        lock.lock();

                        res.value.integer = param_it->second.to_integer();
                        res.value.real = param_it->second.to_real();

                        lock.unlock();
                        rosparam_set_allowed(param_it->second);
                }
                else {
                        ROS_ERROR_STREAM_NAMED("param", "PR: Unknown parameter to set: " << req.param_id);
                        res.success = false;
                }

                return true;
        }

        bool get_cb(mavros_msgs::ParamGet::Request &req,
                        mavros_msgs::ParamGet::Response &res)
        {
                lock_guard lock(mutex);

                auto param_it = parameters.find(req.param_id);
                if (param_it != parameters.end()) {
                        res.success = true;

                        res.value.integer = param_it->second.to_integer();
                        res.value.real = param_it->second.to_real();
                }
                else {
                        ROS_ERROR_STREAM_NAMED("param", "PR: Unknown parameter to get: " << req.param_id);
                        res.success = false;
                }

                return true;
        }
};
}       // namespace std_plugins
}       // namespace mavros

#include <pluginlib/class_list_macros.hpp>
PLUGINLIB_EXPORT_CLASS(mavros::std_plugins::ParamPlugin, mavros::plugin::PluginBase)