Troubleshooting 4G connection on Waveshare-SIM7600

[leighghunt]

Troubleshooting trying to get 4G cellular access working since 3G shutdown

Using modified version of Waveshare's demo scripts (SIM7600X-4G-HAT-Demo/Raspberry/python/AT/AT.py):

AT+CEREG?
+CEREG: 0,4

[leighghunt]

Troubleshooting on envirocam-m:

i@envirocam-m:~/dev/timelapse/scripts$ python troubleshoot4G.py
2026-06-03 18:00:47,117 troubleshoot4G INFO ******************************************************************************
2026-06-03 18:00:47,125 troubleshoot4G INFO
2026-06-03 18:00:47,141 troubleshoot4G INFO Starting up troubleshoot4G.py...
2026-06-03 18:00:47,152 troubleshoot4G INFO
2026-06-03 18:00:47,153 troubleshoot4G INFO ******************************************************************************
2026-06-03 18:00:47,155 troubleshoot4G INFO Troubleshooting 4G connection...
2026-06-03 18:00:47,190 troubleshoot4G INFO Already connected to internet.
2026-06-03 18:00:47,193 SIM7600X DEBUG Powering up SIM7600X...
2026-06-03 18:00:49,300 SIM7600X DEBUG Waiting 20s...
2026-06-03 18:01:09,321 SIM7600X DEBUG SIM7600X should be powered up...
2026-06-03 18:01:09,322 troubleshoot4G INFO Waiting for network....
2026-06-03 18:01:09,388 troubleshoot4G INFO Network connection established.
2026-06-03 18:01:09,391 SIM7600X DEBUG Attempting to force 4G connection...
2026-06-03 18:01:10,412 SIM7600X INFO
RDY

+CPIN: READY

SMS DONE

PB DONE
AT+CREG?
+CREG: 0,2

OK

2026-06-03 18:01:11,427 SIM7600X ERROR AT+CEREG? ERROR
2026-06-03 18:01:11,428 SIM7600X ERROR AT+CEREG? back:  AT+CEREG?
+CEREG: 0,4

OK

2026-06-03 18:01:12,443 SIM7600X ERROR AT+CPSI? ERROR
2026-06-03 18:01:12,444 SIM7600X ERROR AT+CPSI? back:   AT+CPSI?
+CPSI: NO SERVICE,Online

OK

2026-06-03 18:01:13,458 SIM7600X INFO AT+CEER
+CEER: No cause information available

OK

2026-06-03 18:01:14,475 SIM7600X ERROR AT+CNMP? ERROR
2026-06-03 18:01:14,476 SIM7600X ERROR AT+CNMP? back:   AT+CNMP?
+CNMP: 2

OK

2026-06-03 18:01:14,479 SIM7600X INFO Set for automatic connection, attempting to force 4G connection...
2026-06-03 18:01:15,493 SIM7600X INFO AT+CNMP=38
OK

2026-06-03 18:01:16,507 SIM7600X INFO AT+CEER
+CEER: No cause information available

OK

2026-06-03 18:01:16,508 SIM7600X INFO Waiting 60s for modem to register on network after forcing 4G connection...
2026-06-03 18:02:17,543 SIM7600X ERROR AT+CEREG? ERROR
2026-06-03 18:02:17,544 SIM7600X ERROR AT+CEREG? back:
+CEREG: 0,2

OK

2026-06-03 18:02:17,546 SIM7600X INFO Not registered on LTE network, attempting to force 4G connection...
2026-06-03 18:02:18,562 SIM7600X INFO
OK

2026-06-03 18:02:18,566 SIM7600X INFO Waiting 60s for modem to register on network after forcing 4G connection...
2026-06-03 18:03:19,644 SIM7600X ERROR AT+CGDCONT? ERROR
2026-06-03 18:03:19,649 SIM7600X ERROR AT+CGDCONT? back:
+CGDCONT: 1,"IP","CMNET","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","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1
+CGDCONT: 4,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 5,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 6,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

OK

2026-06-03 18:03:19,655 SIM7600X INFO APN not set correctly, attempting to reset APN...
2026-06-03 18:03:20,670 SIM7600X INFO
OK

2026-06-03 18:03:21,684 SIM7600X INFO
OK

2026-06-03 18:03:22,698 SIM7600X INFO
OK

SMS DONE

2026-06-03 18:03:22,702 SIM7600X INFO Waiting 60s after resetting APN...

Lost connection and output at that point

[leighghunt]

Subsequent run remotely:

❯ flakyssh pi@envirocam-m 'cd dev/timelapse/scripts; python troubleshoot4G.py'
** WARNING: connection is not using a post-quantum key exchange algorithm.
** This session may be vulnerable to "store now, decrypt later" attacks.
** The server may need to be upgraded. See https://openssh.com/pq.html
2026-06-03 18:09:52,552 troubleshoot4G INFO ******************************************************************************
2026-06-03 18:09:52,557 troubleshoot4G INFO
2026-06-03 18:09:52,562 troubleshoot4G INFO Starting up troubleshoot4G.py...
2026-06-03 18:09:52,563 troubleshoot4G INFO
2026-06-03 18:09:52,567 troubleshoot4G INFO ******************************************************************************
2026-06-03 18:09:52,571 troubleshoot4G INFO Troubleshooting 4G connection...
2026-06-03 18:09:52,616 troubleshoot4G INFO Already connected to internet.
2026-06-03 18:09:52,618 SIM7600X DEBUG Powering up SIM7600X...
2026-06-03 18:09:54,724 SIM7600X DEBUG Waiting 20s...
2026-06-03 18:10:14,740 SIM7600X DEBUG SIM7600X should be powered up...
2026-06-03 18:10:14,742 troubleshoot4G INFO Waiting for network....
2026-06-03 18:10:14,855 troubleshoot4G INFO Network connection established.
2026-06-03 18:10:14,857 SIM7600X DEBUG Attempting to force 4G connection...
2026-06-03 18:10:15,923 SIM7600X INFO AT+CREG?
+CREG: 0,1

OK

2026-06-03 18:10:16,936 SIM7600X INFO AT+CEREG?
+CEREG: 0,1

OK

2026-06-03 18:10:16,938 SIM7600X DEBUG Registered on LTE network.
2026-06-03 18:10:17,951 SIM7600X INFO AT+CPSI?
+CPSI: LTE,Online,530-01,0xA100,352021,202,EUTRAN-BAND3,1800,5,5,-87,-914,-632,15

OK

2026-06-03 18:10:18,965 SIM7600X INFO AT+CEER
+CEER: Activation rejected, unspecified

OK

2026-06-03 18:10:19,979 SIM7600X ERROR AT+CNMP? ERROR
2026-06-03 18:10:19,981 SIM7600X ERROR AT+CNMP? back:	AT+CNMP?
+CNMP: 2

OK

2026-06-03 18:10:19,984 SIM7600X INFO Set for automatic connection, attempting to force 4G connection...
2026-06-03 18:10:20,998 SIM7600X INFO AT+CNMP=38
OK

2026-06-03 18:10:22,011 SIM7600X INFO AT+CEER
+CEER: EMM detached

OK

2026-06-03 18:10:22,013 SIM7600X INFO Waiting 60s for modem to register on network after forcing 4G connection...
2026-06-03 18:11:23,081 SIM7600X INFO
+CEREG: 0,1

OK

2026-06-03 18:11:24,099 SIM7600X INFO
+CGDCONT: 1,"IP","internet","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","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1
+CGDCONT: 4,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 5,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 6,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

OK

2026-06-03 18:11:24,104 SIM7600X DEBUG APN is set correctly.
2026-06-03 18:11:24,108 SIM7600X INFO Configuration was changed, checking connection status again...
2026-06-03 18:11:25,123 SIM7600X INFO
+CREG: 0,1

OK

2026-06-03 18:11:26,138 SIM7600X INFO
+CEREG: 0,1

OK

2026-06-03 18:11:27,152 SIM7600X INFO
+CPSI: LTE,Online,530-01,0xA100,352041,202,EUTRAN-BAND1,100,5,5,-76,-956,-686,14

OK

2026-06-03 18:11:28,167 SIM7600X INFO
+CEER: DS rejected the call

OK

2026-06-03 18:11:28,169 SIM7600X DEBUG Powering down SIM7600X...
2026-06-03 18:11:49,280 SIM7600X DEBUG SIM7600X powered down...