Hello, Flavio ,
Please clarify, have you tried using SMS commands to block the engine? If yes, then write us the command text.
The fact is that according to the protocol that you specified, this command has several settings and therefore it is important for us to understand which SMS commands you use.
Also, ask if you can provide us with a test device? So that the device is not moving and that it does not accidentally stop due to the engine shutdown.