Featured Articles
Announcing Pi
Technical Specifications
Raspberry Pi FAQs
Win a Pi
Raspberry Pi Wishlist
Actions
Forum Thread Details
  • Replies 2 replies
  • Subscribers 665 subscribers
  • Views 816 views
  • Users 0 members are here
Related

Remote login on raspberry pi using sim900a module

vindhyachal.takniki@gmail.com

1. I have a Pi2 (model b), in the field with sim900A module.

Can I access this pi2 board with remote login using TCP protocol & sim900a module.

 

 

2. I have found one module here:

http://www.sparqee.com/products/

I read that it has capanility to provide remote access. Not sure at this point how it does. Reading it right now.

 

 

3. But I want to do it via SIM900A module. As it is readily available.

Any suggestions on it.

  • Your SIM900A is a modem that communicates with the host over AT commands. Apparently it lists "TCPIP" as features on its datasheet, but it remains an AT modem. If someone were to make a driver that would make it accessible as a "network card" to Linux on the 'pi you'd hit the following problem: You will not get a public IP address from your telephone provider. You would have to setup a VPN to some server on the internet to be able to access your pi from the internet.

     

    So... in short: In theory: yes you can. In practice: not reasonably easy.

  • Hi V T

    This is a modem, so you can achieve remote connection in two ways

    1. through GSM network: put you modem in auto.answer mode (AT S0=2 where 2 is the number of rings before answering) and from you application dial the SIM number. In this way you have a serial link between your application and the SIM900. To use TCP, you need a further level that encapsulates TCP packets into serial packets. This layer is called PPP (Point-to-point protocol)

    2. through GPRS: you have to connect your modem to the GPRS network (the typical command is ATD*99#) Again, you need the PPP protocol to convert TCP packets to serial packets. Your modem connects to your mobile provider's APN and gives SIM900 an IP address. Your SIM900 in theory is reachable at that IP address BUT typically mobile operators NAT IP addresses, so in most cases that IP address is not going to be reachable. From my experience, I can say that some operators allows you to activate a special service (called DENAT) to make the IP address reachable)

     

    Cheers

    Ambrogio