# rc_channels（UORB 消息）
uint64 timestamp # 系统运行以来的时间 启动 (微秒)
uint8 FUNCTION_THROTTLE = 0
uint8 FUNCTION_ROLL = 1
uint8 FUNCTION_PITCH = 2
uint8 FUNCTION_YAW = 3
uint8 FUNCTION_RETURN = 4
uint8 FUNCTION_LOITER = 5
uint8 FUNCTION_OFFBOARD = 6
uint8 FUNCTION_FLAPS = 7
uint8 FUNCTION_AUX_1 = 8
uint8 FUNCTION_AUX_2 = 9
uint8 FUNCTION_AUX_3 = 10
uint8 FUNCTION_AUX_4 = 11
uint8 FUNCTION_AUX_5 = 12
uint8 FUNCTION_AUX_6 = 13
uint8 FUNCTION_PARAM_1 = 14
uint8 FUNCTION_PARAM_2 = 15
uint8 FUNCTION_PARAM_3_5 = 16
uint8 FUNCTION_KILLSWITCH = 17
uint8 FUNCTION_TRANSITION = 18
uint8 FUNCTION_GEAR = 19
uint8 FUNCTION_ARMSWITCH = 20
uint8 FUNCTION_FLTBTN_SLOT_1 = 21
uint8 FUNCTION_FLTBTN_SLOT_2 = 22
uint8 FUNCTION_FLTBTN_SLOT_3 = 23
uint8 FUNCTION_FLTBTN_SLOT_4 = 24
uint8 FUNCTION_FLTBTN_SLOT_5 = 25
uint8 FUNCTION_FLTBTN_SLOT_6 = 26
uint8 FUNCTION_FLTBTN_SLOT_COUNT = 6
uint64 timestamp_last_valid # 上次有效 RC 信号的时间戳 float32[18] 频道 # 比例为 -1..1 (扼杀: 0..1)
uint8 channel_count # 有效通道数 int8[27] function # 功能映射 uint8 rssi # 接收信号强度索引 bool signal_lost # 控制信号丢失, 应与主题超时一起检查 uint32 frame_drop_count # 丢弃的帧数