Hi, I did purchase -> 4G / 3G / 2G / GSM / GPRS / GNSS HAT for Raspberry Pi.
Its come with library files & AT commands manual.
i do manage most of the function with AT Commands on Node Red.
The point i stuck is when reboot this device. i have to manual press POWERKEY to establish GSM communication. This can be enable in code as per attach in above post. The sample code in C++.
Anyway i can do it in NODE RED