I still have the distinct feeling you might be able to resolve this SIM socket situation by taking a tiny pin and dragging the plastic catcher plate back to where it belongs. Beyond the metal retainer clip that holds it in place. You might have to lift the retainer clip a bit to get it to slide past. Image attached.
If you feel uncomfortable with that then by all means please don’t try it and just send it back to get a replacement. But I can imagine you’d like to get started fiddling with this awesome engineering board just like I did
In answer to your question:
It is quite a hassle to get the board going driver wise. As always with 3G/4G/LTE hardware. There are many ways of approaching it.
The device exposes /dev/ttyUSB0 to /dev/ttyUSB4 (it’s even got a built in GPS!!!) when loaded up with the right driver and you can choose the PPP way of trying to establish an internet connection, but that didn’t work for me in my case with my SIM and my carrier.
In fact after a few hours searching I decided to try the QMI (NDIS) interface that is also available on the board and make use of the higher level abstracted wwan0 interface to establish a connection. This required me to upgrade the firmware to Chaos Calmer and do some more fiddling which I will be happy to elaborate on once you get to it but it is beyond the scope of this reply at this stage.
I ended up going for QMI and I managed to establish a relatively stable 3G connection with the entire unit. It is awesome but I still need to hone down the init scripts etc.
This is a nice link if you want to learn about the UC20’s interfaces (I don’t know which board you have got maybe the Quectel 4G but you will be able to find docs for that one too) CLICK LINK HERE
The board I have came with “OpenWrt Chaos Calmer 15.05”.
Looking at my modem device I do not have any /dev/ttyUSB’s. I only have /dev/tty/ATH0 and ttyS0 till ttyS15.
The thing is that I’ve setup several GL-AR150’s with a USB stick GSM modem, and they all work fine.
Problem is this board, and as I’m not sure if this “SIM socket” is a problem or not as I can not get it to work.
Will give your “retainer lift” a go tomorrow when I’m fresh again
re: In fact after a few hours searching I decided to try the QMI (NDIS) interface that is also available on the board
I’ve not found this interface. I did however find the Domino Web Panel (in my case: http://192.168.1.1/cgi-bin/luci/webpanel/homepage )
@Guest, glad that you repaired the sim slot. Seems sometimes, when people use a trimmed sim card, which is a little thicker, it will bend the pins inside so you cannot insert the card in. But seems you don’t have this problem. Glad to know.
Don’t upgrade Domino firmware. Domino firmware is for Domino Pi actually. The MiFi board compiled the firmware based on Domino firmware but didn’t correct the firmware links. We will upload a new firmware and instructions to the website.
Sorry for no docs. But you guys are great and working it out.
Okay. Still having problems getting the 3G radio to work.
ls /dev/ gives me:
ttyI0 to ttyI63
ttyUSB0 to ttyUSB4
I’ve tested ttyATH0 and ttyUSB0 till ttyUSB4 but no luck.
I would like to make a “terminal” connection to one of the tty’s and send an AT command to see if I get a response back.
Normally I use screen to connect (ie: screen /dev/ttyUSB0), but screen is not available!