@jkandasa
I'm just designing a smart home system.
Do you use a MQTT connection to the controller?

ESP8266 memory is enough. You can add a communication check to the controller (for example, a request for the current time). And then you can restart SIM800L through an external pin on the module, and you can also restart ESSP8266.

Hello.
Is it possible to add support for the gateway with TinyGSM without MQTT?
Controller IoBroker can work in server mode for a gateway with TinyGSM.