随时记录解决

1. 设置gcs_link相关

auto gcs_link = MAVConnInterface::open_url("udp-b://@");

mavlink::common::msg::HEARTBEAT hb{};
// fill hb

gcs_link->send_message_ignore_drop(hb);
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2. 在mavros中send_message_ignore_drop 会调用fcu_link

UAS_FCU(&mav_uas) = fcu_link;
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3. gcs_link的时候，调用的是fcu_link发送

if (gcs_link) {
		// setup GCS link bridge
		gcs_link->connect([this, fcu_link](const mavlink_message_t *msg, const Framing framing) {
			this->last_message_received_from_gcs = ros::Time::now();
			fcu_link->send_message_ignore_drop(msg);
		});

		gcs_link_diag.set_connection_status(true);
	}
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4. ros发送消息给QGC
   https://github.com/mavlink/mavros/issues/574

#include 
#include 
#include 
#include 

// General parameters
uint8_t system_id = 1;
uint8_t component_id = 1;
uint8_t type = 1;
uint8_t autopilot = 0;
uint8_t base_mode = 128;
uint32_t custom_mode = 0;
uint8_t system_status = 0;

// Parameters of the altitude message
float alt_monotonic = 10.0;
float alt_amsl = 100;
float alt_local = 10.0;
float alt_relative = 10.0;
float alt_terrain = 10;
float bottom_clearance = 0;

int main(int argc, char **argv){

    // Create heartbeat message
    mavlink_message_t msg_heartbeat;
    mavlink_msg_heartbeat_pack(system_id, component_id, &msg_heartbeat, type, autopilot, base_mode, custom_mode, system_status);

    mavros_msgs::Mavlink ml_heartbeat;
    mavros_msgs::mavlink::convert(msg_heartbeat, ml_heartbeat);

    // Create altitude message
    mavlink_message_t msg_altitude;
    mavros_msgs::Mavlink ml_altitude;

    ros::init(argc, argv, "telemetry_publisher");
    ros::NodeHandle n;

    ros::Publisher example_pub = n.advertise<mavros_msgs::Mavlink>("/mavlink/from", 1000);
    ros::Rate loop_rate(1); // 1 Hz

    while (ros::ok())
    {
        uint64_t time_stamp = ros::Time::now().nsec;

        // Finish altitude message
        mavlink_msg_altitude_pack(system_id, component_id, &msg_altitude, time_stamp, alt_monotonic, alt_amsl, alt_local, alt_relative, alt_terrain, bottom_clearance);
        mavros_msgs::mavlink::convert(msg_altitude, ml_altitude);

        // Publish messages
        example_pub.publish(ml_heartbeat);
        example_pub.publish(ml_altitude);

        ros::spinOnce();
        loop_rate.sleep();
    }
    return 0;
}
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