I need a dual SIM GSM/GPRS module for my application and I was thinking of the HL6528 module.
Since I need both the SIM to be registered on the network and use the GPRS data transmission on different APNs, I was wondering if the dual sim / dual standby implementation would be able to satisfy my requirements.
As far as I have read from the user guides, in order to poll the tcp buffer the active SIM has to be enabled by AT commands.
The ideal workflow would be:
- GPRS Attach + PDP context activation on SIM 1;
- switch to SIM2;
- GPRS Attach + PDP context activation on SIM 2;
(in an endless loop):
- switch to SIM1
- check if SIM1 has GPRS data incoming -> answer back
- switch to SIM2
- check if SIM2 has GPRS data incoming -> answer back
Sorry if the question may sound trivial, but I have never used GSM/GPRS modules before.