code: def set_relay(self, relay_pin=0, state=True):
          '''Set relay_pin to value of state'''
          if self.mavlink10():
              self.mav.command_long_send(
                  self.target_system,  # target_system
                  self.target_component, # target_component
                  mavlink.MAV_CMD_DO_SET_RELAY, # command
                  0, # Confirmation
                  relay_pin, # Relay Number
                  int(state), # state (1 to indicate arm)
                  0, # param3 (all other params meaningless)
                  0, # param4
                  0, # param5
                  0, # param6
                  0) # param7
          else:
              print("Setting relays not supported."f set_relay(self, relay_pin=0, state=True):
          '''Set relay_pin to value of state'''
          if self.mavlink10():
              self.mav.command_long_send(
                  self.target_system,  # target_system
                  self.target_component, # target_component
                  mavlink.MAV_CMD_DO_SET_RELAY, # command
                  0, # Confirmation
                  relay_pin, # Relay Number
                  int(state), # state (1 to indicate arm)
                  0, # param3 (all other params meaningless)
                  0, # param4
                  0, # param5
                  0, # param6
                  0) # param7
          else:
              print("Setting relays not supported.")
docs: Set relay_pin to value of state