U_CELL_NET: unable to disconnect. #56

alexmaron81 · 2022-07-19T09:52:50Z

What could be the reason for the fact that the connection is unable to disconnect?

U_CELL_MQTT: trying to disconnect...
AT+UMQTTC=0

+UMQTTC: 0,1

OK
Taking down network...
AT+COPS?

+COPS: 0,0,"262 01 1nce.net",9

OK
AT+CFUN=4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
U_CELL_NET: unable to disconnect.

RobMeades · 2022-07-19T10:20:10Z

Hi Alex! That AT log is very weird indeed.

The module has clearly responded to AT+CFUN=4 with OK, which should mean that it has detached and switched the radio off, yet, when the ubxlib code calls the registration status commands to check, the network layer in the module still thinks it is connected.

There's nothing much that ubxlib can do about this; let me try consulting our SARA-R412M-02B support people to see if they have seen anything like this.

RobMeades · 2022-07-19T16:29:47Z

Unfortunately they've not seen anything like this before: how repeatable is it?

alexmaron81 · 2022-07-19T17:55:10Z

It is practical for every connection.

RobMeades · 2022-07-19T20:02:49Z

Okay, in that case, when you have time, could you possibly modify the function disconnectNetwork() in u_cell_net.c so that, just before the comment line:

                    // Prod the modem to see if it is done

...you have the following:

                    uAtClientLock(atHandle);
                    uAtClientCommandStart(atHandle, "AT+CFUN?");
                    uAtClientCommandStopReadResponse(atHandle);
                    uAtClientUnlock(atHandle);

...i..e we want to query the AT+CFUN state of the module to confirm that it really is in AT+CFUN=4 like we've told it to be. I've attached a .zip file containing the intended modified u_cell_net.c if you prefer to just replace your existing file with that.

Then paste the AT log into a comment here.

alexmaron81 · 2022-07-20T05:48:27Z

U_CELL_MQTT: trying to disconnect...
AT+UMQTTC=0

+UMQTTC: 0,1

OK
Taking down network...
AT+COPS?

+COPS: 0,0,"262 01 1nce.net",9

OK
AT+CFUN=4

OK
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
AT+CFUN?

+CFUN: 4

OK
AT+CREG?

+CREG: 2,3

OK
0: Deny
AT+CFUN?

+CFUN: 4

OK
AT+CGREG?

+CGREG: 2,4

OK
0: OoC
AT+CFUN?

+CFUN: 4

OK
AT+CEREG?

+CEREG: 4,5,"DAD9","10","22A9B06",B,,,"00000000","01100000"

OK
0: RegR
U_CELL_NET: unable to disconnect.

RobMeades · 2022-07-20T08:23:07Z

Thanks for doing that so quickly. Putting it simply, it should not be possible for the module to do this. Would you be able to capture the full AT log, from startup, and attach it to a comment as a .txt file here? Then we can see if we can reproduce it.

alexmaron81 · 2022-07-20T09:33:06Z

Hi Rob,

attached the txt file
i just deleted the ip address and user with password in the log

unable to dissconnect.txt

RobMeades · 2022-07-20T09:34:58Z

Excellent, thanks, we'll take a look.

RobMeades · 2022-07-20T15:40:43Z

While we're doing that, the guys have requested a little more information. When you get the chance, could you possibly try using the attached u_cell_net.c and pasting the AT log output into here? This version queries a few more things while waiting for the registration status.

If one of those returns a better indication then we could potentially use that additional information to determine that the disconnect has occurred, rather than relying solely on +CEREG.

alexmaron81 · 2022-07-21T09:22:10Z

here is the log with the integrated u_cell_net.c from the zip file.

Is it ok because I somehow don't see any difference?

unable to dissconnect with new u_cell_net file.txt

RobMeades · 2022-07-21T09:26:08Z

Hmm, strange, maybe uploading a .zip file here with the same name twice didn't work?

Here's u_cell_net.c again, zipped with a different zip-file name this time.

alexmaron81 · 2022-07-21T09:54:10Z

now the new log

unable to dissconnect with new u_cell_net file.txt

RobMeades · 2022-07-21T09:58:27Z

Excellent!!!! That shows that when we are getting "connected" responses from +CEREG, the other indications:

AT+CGATT?
+CGATT: 0
OK
AT+CGACT?
+CGACT: 1,0
OK
AT+CGDCONT?
+CGDCONT: 1,"IP","iot.1nce.net","0.0.0.0",0,0,0,0
OK

...all show that there is no connection. What I am going to do is to modify the "disconnect" code to also check AT+CGATT? and, if that says we're disconnected, it will override and accept that we are disconnected. I will try to do this today and let you know when it's available.

RobMeades · 2022-07-21T17:08:17Z

I have pushed a test branch here with the changes to the disconnect code. I have verified that the changes cause no problems but we have not been able to reproduce your issue here so, when you get a chance, could you try it out please? You can either pull the branch or you can just replace the contents of your current u_cell_net.c with the one from the branch.

Let us know what happens and, if at all possible, paste an AT log of the outcome into a comment here.

alexmaron81 · 2022-07-22T05:16:18Z

The problem was fixed with #57

RobMeades · 2022-07-22T08:26:55Z

Great, thanks for raising it and begin so patient/helpful in resolving it.

RobMeades · 2022-07-22T08:39:35Z

The fix has now been pushed to the master branch here and the temporary test branch has been deleted.

RobMeades self-assigned this Jul 19, 2022

RobMeades mentioned this issue Jul 21, 2022

Unable to connect to MQTT broker #57

Closed

alexmaron81 closed this as completed Jul 22, 2022

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U_CELL_NET: unable to disconnect. #56

U_CELL_NET: unable to disconnect. #56

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U_CELL_NET: unable to disconnect. #56

U_CELL_NET: unable to disconnect. #56

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