I am going to design a mobile testing device, which uses a SIM800 GSM/GPRS Module. It has a 5000mAh Lithium battery which poweres everything. I am using MQTT to send / receive data from the device.
Now I would like to know if anyone has an idea how to lower the current consumption, is it somehow possible to put the module in a sleep mode, but the GPRS connection stays alive, so that it can receive a TCP message and wake up fully again? I mean a standard mobile phone, is switched on all day long, and is receiving whatsapp / facebook messages which also uses MQTT and the current consumption is less than the SIM800.
Would be very nice if I could get some hints