in ctrl_pkg/src/ctrl_state.cpp [550:562]
void CalibrationCtrl::setLedValue(int redPwm, int greenPwm, int bluePwm) {
auto ledRequest = std::make_shared<deepracer_interfaces_pkg::srv::SetLedCtrlSrv::Request>();
ledRequest->red = redPwm;
ledRequest->green = greenPwm;
ledRequest->blue = bluePwm;
auto future_result = servoSetLedClient_->async_send_request(ledRequest);
future_result.wait();
auto ledResponse = future_result.get();
if(ledResponse->error != 0){
RCLCPP_ERROR(ctrlNode->get_logger(), "Setting LED failed.");
}
}