Using pymavlink to control bluerov

[EliotBR (Eliot)]

Hi @JiaXu_Zhang, welcome to the forum

@JiaXu_Zhang

… when operating channel 8, the light does not reflect,I observe master.recv_ Match () found that channel 9 has not changed, and the pwm is still 1100.

RC inputs are not the same as RC outputs.

1. Have you configured your output 9 channel to correspond to Lights1 inputs (by setting SERVO9_FUNCTION to RCIN9, or via the Lights page in QGroundControl)?
2. Does it work to control the lights using QGroundControl?
3. Is there a reason you’ve changed the set_rc_channel_pwm function to use zero-based indexing for the channel-id, and only provide 12 values instead of the 18 used in our example?

@JiaXu_Zhang

The version of pymavlink is 2.4.8(because V2.4.34 can not set mode,I also can not understand)

That shouldn’t be necessary. Both lights control and mode changing are working fine for me on Pymavlink 2.4.37 (I just updated it to the latest version).

Note that if you’re using BlueOS there may be issues with changing mode if you have not explicitly waited for an autopilot heartbeat, because there are other MAVLink components on the same system.