Ive got this sim900 module and Im able to send sms and make calls from it, using the marcomartines github sim900 library.
But when I try to communicate via AT commands directly I run into problems. When I try to send an sms using:
I do get the > prompt. I enter some text like:
hello there and immeditately I get nothing. If I send 26 or 1A, I get nothing back. If I send 0x1A I somtimes get the > prompt to disappear but not everytime.
So I tried some more basic commands and here are some results:
����ATD+504mynumber NO CARRIER ����ATD+mynumber NO CARRIER ����AT+CPIN? ����AT+CSQ +CSQ: 0,0 OK ����AT+COPS? +COPS: 0 OK ����AT+CGMI SIMCOM_Ltd OK ��������AT+CGMM SIMCOM_SIM900 OK ����AT+CGSN 013955673954320 OK AT+CNUM ERROR ����AT+ATE1 ERROR ��������AT+ATE1 ERROR AT+ATE0 ERROR
Any ideas what I could do?
PD 1: my sim is in the module 2: I can make calls and send sms when sim is in phone 3: I just noticed each time I put the sim back in the phone and try to send an sms, the phone notifies me that is is requesting a network configuration and if I don't click on Accept, the sms I was sending is not received. The instant I click on accept, the sms is received on my target phone.
So I'm wondering if I'm missing a command before being able to send the sms from the module?