I’m looking for a relyable method to be sure that my module is still connected to the APN. I am thingking of using at+wipping to ping myself.
Currently if I ping some server connected to the same APN as my module, the ping response time is approx 800ms. If I ping myself, the response time is 5ms. It seems a bit suspicious that the self-ping response time is so much lower.
Does ping-ing yourself even use the GSM network, or does the OpenAT recognise the self-ping and just say it was successfull?
Would opening one server socket and one client on the same module and then sending data beteween the sockets be a better (and fool-proof) test?