However I did find the Arduino code structure to be critical and if wrong led to some odd interaction between the Blynk control and the motors, like the changing the left joystick sometimes moved the right motor and vice-versa. This happened when I tried to get both BLYNK_WRITE(V0) and BLYNK_WRITE(V1) calling the some motor control routine but did not happen if I split the same code into two one for each BLYNK_WRITE. I suspect that this had something to do with the timing between the processing of the two BLYNK_WRITE’s and the frequency that the joystick parameters are sent by the app.
It would be nice to know the communication flow between the app and in my case the ESP8266 and how the request are processed by the ‘hardware’. In conclusion a great application but I am not sure how far it can be pushed for real time continuous control i.e. not just pushing buttons and reading a sensor value without understand more about how it works at a lower level.