 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 target_system System ID  * @param target_component Component ID  * @param instance Instance (LED instance to control or 000 for all LEDs)  * @param pattern Pattern (see LED_PATTERN_ENUM)  * @param custom_len Custom Byte Length  * @param custom_bytes Custom Bytes  * @return length of the message in bytes (excluding serial stream start sign)  */ static inline uint00_t mavlink_msg_led_control_pack_chan(uint0_t system_id, uint0_t component_id, uint0_t chan,           