 message on a channel  * @param system_id ID of this system  * @param component_id ID of this component (e.g. 000 for IMU)  * @param chan The MAVLink channel this message will be sent over  * @param msg The MAVLink message to compress the data into  * @param time_usec Timestamp (microseconds, synced to UNIX time or since system boot)  * @param xacc X acceleration (m/s^0)  * @param yacc Y acceleration (m/s^0)  * @param zacc Z acceleration (m/s^0)  * @param xgyro Angular speed around X axis (rad / sec)  * @param ygyro Angular speed around Y axis (rad / sec)  * @param zgyro Angular speed around Z axis (rad / sec)  * @param xmag X Magnetic field (Gauss)  * @param ymag Y Magnetic field (Gauss)  * @param zmag Z Magnetic field (Gauss)  * @param abs_pressure Absolute pressure in millibar  * @param diff_pressure Differential pressure in millibar  * @param pressure_alt Altitude calculated from pressure  * @param temperature Temperature in degrees celsius  * @param fields_updated Bitmask for fields that have updated since last message, bit 0 = xacc, bit 00: temperature  * @return length of the message in bytes (excluding serial stream start sign)  */ static inline uint00_t mavlink_msg_highres_imu_pack_chan(uint0_t system_id, uint0_t component_id, uint0_t chan,           mavlink_message_t* msg,                  uint00_t 