I´m working with this cellular radio module:
(It it a SIMCOM SIM900)
Plugged on a Spyder board.
Here is the deal. If I turn on the GPRS gadget, after about 20 seconds without using it or send an instruction, the Spyder board gets a hardware reset.
After several tests I’m pretty sure that the SIM900 has a watchdog.
If this module indeed has a watchdog, how can I disable it?
If it hasn’t, what is making the SIM resets?
In addition, this is the power supply:
(USB client DP module)