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pi based braumesiter wifi module

Discussion in 'Electronics, Hardware & Software' started by RogueRanga, 9/5/19.

 

  1. RogueRanga

    New Member

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    Posted 9/5/19
    I have been trying to figure out how to make a raspberry pi based wifi module for the BM. so far I have figured out the pinout for the UART port on the BM and I can connect a PC to the BM. When I connect the BM to the PC the lights turn green ready for the firmware to be uploaded. I dont have a wifi module handy to fix it if I brick it with my cable so I have not tried to flash new firmware yet. A few beers one night might change that...

    The next step is to figure out how to get past the "wifi modul not present" message on the BM when I try to enable the wifi module. I have used a Bus Pirate to as a logic analyser but it does not output anything. I tried to reverse engineer the firmware but it looks like its encrypted. I looked at the strings in the firmware and it looks like the wifi module talks to the BM with AT commands. i have done some reading and the wifi module is a wifi to serial server. Something like a rs 9110:
    http://www.redpinesignals.com/Produ...9110_Modules/Connect-io-n/RS-9110-N-11-24.php

    I'm pretty sure there is some negotiation that happens when the wifi unit is plugged into the BM (baud rate etc) but I cant figure that pert out yet.

    Does anyone have some pictures of the insides of the wifi unit? I would like to know what wifi to serial device speidel is using exactly so I can try to get a pi to do the same thing. any pics or input would be appreciated
     
  2. mojonojo

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    Posted 16/5/19
  3. RogueRanga

    New Member

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    Posted 16/5/19
    Yeah someone has made a web front end for the wifi module but no one has tried to reverse engineer the wifi module or the protocol.

    My guess is that when the module is plugged in and powers on, it sends a connect packet to the BM. The hard part is working out what that is without a wifi module.

    I've done some more digging and discovered that the other 8 headers in the middle of the board are JTAG. Atmel use a proprietary JTAG so I would need a dragon or atmel-ice to debug it (which I don't have)
     

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