Thanks for your reply 🙂 Do you know what the difference between sleep and idle state is? Will the unit be in idle state as long as the raspberry pi is running and there is a 3G/4G signal, but not transfering? If not, what trigers the idle mode?
Here is how IDLE and SLEEP mode are defined.
IDLE: Software is active. The module has registered on the network and it is ready to send and receive data.
SLEEP: The current consumption of the module will be reduced to the minimal level. During this mode, the module can still receive paging message and TCP/UDP data from the network normally.
After powering on the Module, the device waits in Idle mode.