Did any of you connected single channel gateways with GSM module to Internet? Do you have some schematics and code?
I want to make that if my board (ESP32, ESP8266) doesn’t have WiFi connection, turns on GSM module (SIM800L), and than uses that connection to server.
Thanks 
to start experimenting you need a sim card … preferable one with only data.
and be carefull which module you use… take one with a 5v connection because the very cheap ones don’t have an onboard regulator, and the chip itself wants between 3.8 - 4.4 volt… if you put 5 volts on it… it never talks again
another point is ’ when you cycle power’ you have to enter you PIN code again, So use a tool and remove the pincode from the sim card.
You can do that, and test all network function with this tool, it will recognize the 800L
I could never get the 800L do what I want 
(mqtt over gprs , only sending some SMS) also the network operator blocked sometimes. not recognizing ‘the phone’… spent many hours and finally bought a commercial product 
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