Fabian Ramirez Zamora

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7 years, 3 months ago.

SIM800L + Nucleo L152RE

Hi im trying to use de Hello World with another GPRS module, im very new at this, but i was doing some research and for what I have learned, Its supposed to work fin despite im using the sim900 module on the seed shield or a 800L module isnt it?, as far as I know it has the same AT commands, I'm adding the corresponding APN, usr and password. But in the serial terminal it keeps showing the message: Could not connect to network. Retrying!

If anybody had the same problem I would apreciate your help.

Question relating to:

Last updated: 29 Apr 2015

1 Answer

Jan Jongboom
7 years, 2 months ago.

Here's a useful trick:

  1. Install SerialPassthrough on your dev board and set the pins to the GPRS shield you're using.
  2. Connect to the dev board over serial.
  3. Now you can talk directly to the shield, try to use the AT Command reference (should be part of the manual for your shield) and see if you can connect to the network.

If that works, check the driver for the Seeed GPRS shield and look at what it does differently.

Accepted Answer