I have tried the following with both a Raspberry Pi 1 and RPi 3, using Resin OS 2. My goal is to get the Raspberry Pi to use a SIM800 GSM module to get internet for Resin.io to work. I tried two methods as described below. In both cases I enabled the UART on the RPi’s gpio header, and disabled the…

Hi @jpmeijers , In our docs, we have a guide for GSM based connections https://docs.resin.io/deployment/network/2.0.0/#cellular-modem-setup . I think you’re missing a configuration for your modem. Please follow the guide in our docs and let us know if you need further support.

Hi @nghiant2710 Your guide is exactly where I started. The problem is you can not specify a specific port for the GSM modem in the /resin-boot/system-connections/my-gprs-connection configuration file. This makes sense because Modem Manager auto detects the port on which a modem is connected. As I …

Hey @jpmeijers This issue looks like it could be helpful for your first question. For your second question, the resin supervisor starts when the device is booted up irrespective of the connection status. I am not sure why the /etc/network/interfaces file changes are ignored, how did you apply them…

I think I finally figured it out after reading ModemManager’s source code . It seems like ModemManager goes and look at the physical device at the root of the uart. Therefore not /sys/devices/platform/soc/20201000.uart/ but /sys/devices/platform/soc/. Therefore this udev rule (I tried multiple inclu…

Hey @jpmeijers , I guess you were saying that you’ll add that udev rule to the host OS? If so, I’d would probably recommend trying the udev rule within the container, see if that would work (ie. connecting to normal network let’s say over ethernet, pulling the application and then disconnecting the n…

Hi, in order to see why it is not connectiong to the resin dashboard, could you please check the output of: journalctl --no-pager -u openvpn-resin (maybe leave out the private stuff if you want to paste it here :slight_smile: )

Hey @jpmeijers , Sorry for bumping this old thread but I’m at a loss right now. I’m running into the same issue using the SIM808. Did you happen to find anything else out about this issue? I added the udev rule and used the system-connection file provided. I can’t seem to get the modem to show up …

@Bioto is there any info in the logs, as mentioned above? What OS version are you running now / what device type? Would it be possible enable support access and share with us a device with the connected modem that is in that state? Maybe we can take a look and advise better then. Thanks!

OS: balena-cloud--raspberry-pi-2.24.0+rev1-dev Device: raspberry pi zero w cat /var/log/messages Nov 8 05:35:06 localhost authpriv.warn login[1202]: invalid password for ‘UNKNOWN’ on ‘/dev/ttyS0’ Nov 8 05:35:09 localhost authpriv.warn login[1202]: invalid password for ‘UNKNOWN’ on ‘/dev/tty…

@imrehg Hey, was just checking in.

Raspberry Pi + SIM800 for GPRS

Product support

jpmeijers February 21, 2019, 8:02pm 25

Seems like one need to enable/power-on the modem before the serial connection becomes available:

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Raspberry Pi + SIM800 for GPRS

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