test better ROS error checking code

[joshua-8]

https://github.com/micro-ROS/micro-ROS-demos/blob/167b373fb4b1e336c945aafa23f65dfb42d0a5d0/rclc/epoch_synchronization/main.c#L13

[joshua-8]

#define RCCHECK(fn)                                                                   \
    {                                                                                 \
        rcl_ret_t temp_rc = fn;                                                       \
        if ((temp_rc != RCL_RET_OK)) {                                                \
            Serial.printf("FAIL RCCHECK, from file %s, line %d", __FILE__, __LINE__); \
            error_loop();                                                             \
        }                                                                             \
    }

works!