SIM908 EVM board and HTTP POST

Hi there,
I am having a SIM908 EVM board. I was able to send AT Commands and receive GPS data from a hyper terminal and a PIC24F.

My next step is to send the GPS data to a backend server over a HTTP POST. I inserted a sim card in the EVM Board. I am using a normal power supply provided in the EVM kit. The VBAT LED is steady Blue, the GSM_NET Led is blinking at regular intervals.

I am not able to connect to the GSM network. My sim card does not have any pin enabled.

when I type
AT+CSQ

the result is
+CSQ: 0,0

for the command
AT+COPS?

it returns
+COPS: 0

I am testing from my window..and outside is an open field..and I get good signal reception from my normal mobile phone.

Is there something I am missing... turning on the gsm module or need to provide some parameters to the EVM board to connect..? can someone guide me please..?
thanks
Stap

Hi Stap

I have one(sim908 evb) and I could not even get the location info. I always having the problem:" Location Unknown" I think my command sequence is true but there might be a trick with the antenna connections. I connect them to the relevant connectors on the board. j100 and j103
https://www.electrodragon.com/wp-content/uploads/2011/12/SIM908-EVB-Schematics.pdf

How did you overcome this problem?

Hi,

DTR MUST be grounded according to SIM instructions
VANT needs to be Active to receive GPS signals.

Please try the demo software from SimCom to check if your board is working. Then derive your AT commands.

cheers
S

staples07 said:

Hi,

DTR MUST be grounded according to SIM instructions
VANT needs to be Active to receive GPS signals.

Please try the demo software from SimCom to check if your board is working. Then derive your AT commands.

cheers
S

Click to expand...

Hello Stap,

I tried the nmea gps demo v3.00 and followed the steps that is mentioned in the development kit manual. When I run the software it gave a response

"Fail: No NMEA Gps Output! Please check."

Is this an antenna problem or my board is not working? Thank you...

hi, Stap.
if you use van mode, this mode,do you have a methode to MCU can process while signal send back to consecutive.
Sory my english too bad.