Thank you! For some reason, today it is being detected (at first).
Summary
I once saw the Verizon card detected, but could not connect to the network. I once saw the AT&T card detected and connect to the network. I can no longer get either to work correctly, even though I haven't changed anything. So I suspect this is a hardware issue. Another possibility is that switching between providers on the same IMEI is causing connectivity problems.
Details
I didn't change anything about the hardware or configuration since yesterday, but today it worked. I can see the IMSI and ICCID in the WiFix interface, and the 3G/4G LED on the front is now lit.
I can also see that the SIM query works:
Code: Select all
AT+QSIMSTAT?
T+QSIMSTAT?
+QSIMSTAT: 0,1
I can also see this APN list in the debug information:
Code: Select all
AT+CGDCONT?;+CFUN?
+CGDCONT: 1,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","vzwadmin","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","vzwinternet","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
...
Which to me says that data is either being read from the SIM or from the cell tower (I don't know how this works). Because it says "IPV4V6" I thought maybe it could be an issue with the fact that I set the protocol to "IPv4" only. So I tried changing the connection profile to "IPv4+IPv6" and also tried "Default". Both of these still yields the same behavior of looping between "Attempting to Connect" and "Retry Connection".
I bought an AT&T SIM for the same IMEI today, updated the APN to "NXTGENPHONE" (other settings unchanged, TTL is still 64, MTU is still 1427), and inserted the SIM. Initially I got the same behavior as yesterday (no ICCID or IMSI, AT+QSIMSTAT? returned 0,0). Then I added a small thin piece of plastic to the SIM card adapter, rebooted the router, and now it is detected again. So I suspect either reboots are important, or there is a hardware failure with the SIM reader or SIM card.
If I use socat to monitor the behavior in realtime, does this block other connections/queries to the modem from WiFix? Or can they run simultaneously? It seems like they block each other.
Initially after inserting the AT&T SIM, the WiFix interface did not display the ICCID or IMSI even though I could see it in socat. Once I stopped monitoring with socat, WiFix showed the ICCID and IMSI. And it also shows that I am now connected to an AT&T cell tower with 83% signal strength. I disconnected my WAN connection and I successfully tested ping and DNS resolution over ssh. I ran OpenSpeedTest in the WiFix interface and I can see 21 Mbps down, 16 Mbps up, 30ms ping.
Now that I know everything can work in theory, I removed the AT&T SIM, changed the APN back to "VZWINTERNET", inserted the Verizon SIM, and rebooted the router. I did not connect to the modem over socat. The ICCID and IMSI are "Unknown" and going to "Miscellaneous" and sending the AT Command "AT+QSIMSTAT?" returns "0,0". Under the "Connection Log" I can see it says "Attempting to Connect" then "Retry Connection".
I remove the SIM card adapter, add more thin plastic to, reinsert the SIM card, reboot the router. "AT+QSIMSTAT?" still returns "0,0". I remove the SIM, blow on the SIM reader like an old video game, reinsert the SIM and reboot the router. Still nothing, even after waiting a few minutes. I remove the Verizon SIM, insert the AT&T SIM, change the APN to "NXTGENPHONE" and reboot the router. I do not see the IMSI or ICCID. AT+QSIMSTAT? returns 0,0. I eject and reinsert the AT&T SIM and reboot the router. Still no ICCID or IMSI, "AT+QSIMSTAT?" returns 0,0. I remove the AT&T SIM and put it in my iPhone 6S, it immediately works. I reinsert the AT&T SIM into the router and reboot the router. Same behavior as before, no ICCID or IMSI, SIM query is 0,0. I wait 5 minutes. Still nothing. Looking at the Modem Debug Information shows a lot of errors:
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Fri Jul 8 17:01:29 2022 : /dev/ttyUSB2 AT+COPS=3,2;+COPS?
+COPS: 0
OK
Fri Jul 8 17:01:31 2022 : /dev/ttyUSB2 AT+CGDCONT=?
+CGDCONT: (1-24),"IP",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"PPP",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV6",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV4V6",,,(0-3),(0-4),(0-1),(0-1)
OK
Fri Jul 8 17:01:32 2022 : /dev/ttyUSB2 AT+CGDCONT?;+CFUN?
+CGDCONT: 1,"IPV4V6","NXTGENPHONE","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","SOS","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1
+CFUN: 1
OK
Fri Jul 8 17:01:45 2022 : /dev/ttyUSB2 AT+CPMS="SM"
ERROR
Fri Jul 8 17:02:03 2022 : /dev/ttyUSB2 AT+QSIMSTAT?
+QSIMSTAT: 0,0
OK
Fri Jul 8 17:02:05 2022 : /dev/ttyUSB2 AT+CPMS="SM"
ERROR
Fri Jul 8 17:02:26 2022 : /dev/ttyUSB2 AT+CPMS="SM"
ERROR
Fri Jul 8 17:02:29 2022 : /dev/ttyUSB2 AT+COPS=3,2;+COPS?
+COPS: 0
OK
Fri Jul 8 17:02:31 2022 : /dev/ttyUSB2 AT+CGDCONT=?
+CGDCONT: (1-24),"IP",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"PPP",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV6",,,(0-3),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV4V6",,,(0-3),(0-4),(0-1),(0-1)
OK
Fri Jul 8 17:02:32 2022 : /dev/ttyUSB2 AT+CGDCONT?;+CFUN?
+CGDCONT: 1,"IPV4V6","NXTGENPHONE","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","SOS","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1
+CFUN: 1
OK
Fri Jul 8 17:02:46 2022 : /dev/ttyUSB2 AT+CPMS="SM"
ERROR
I have ordered two more routers. One of this same model, one that is a different model (Cudy AC1200). I would appreciate any ideas for what else I can check next until the new hardware arrives.
