Notes.mb
enum msp_result_e { MSP_RESULT_ACK = 1, MSP_RESULT_ERROR = -1, MSP_RESULT_NO_REPLY = 0, MSP_RESULT_CMD_UNKNOWN = -2, // don't know how to process command, try next handler };
MSP task calls _msp_serial.process_input() calls _msp_stream.put_char calls process_received_command calls _msp_base.process_command calls process_write_command (gets parameters and writes dst) returns MSP_RESULT_ACK or MSP_RESULT_CMD_UNKNOWN or process_read_command (reads src and sets parameters) returns MSP_RESULT_ERROR or MSP_RESULT_ACK serial encodes frame into MSP format calls _msp_serial->send_frame calls _msp_serial_port.write