+CMS ERROR: 512，how to recover Q2687

[cowley]

Hi, guys
When I send sms via Q2687, I meet a error, the error code is 512, how can I recover my Q2687 modem?
Thanks for any help!

[cowley]

@cowley

Hi, guys
When I send sms via Q2687, I meet a error, the error code is 512, how can I recover my Q2687 modem?
Thanks for any help!

“+CMS ERROR:512” indicate ‘MM establishment failure’.
This error occurs when you try to send a message and the module is receiving another one at the same time. This causes a collision in the message transfer protocol resulting in failure in sending the SMS and hence, +CMS ERROR: 512.

How can I cancel the old sms which not send out, before I send new one?
Thanks for any advise!

[cowley]

Nobody know how to do?

[awneil]

You just need to re-try the message

[cowley]

@awneil

You just need to re-try the message

How to re-try? send any SMS via AT+CMGS command, aways return the same ERROR code 512.

[cowley]

Can I clean the unsend sms queues via AT command or ADL API. I am new, wish someone can help me!

[cowley]

Be the way,
My Q2687 firmware version : R71_00gg.Q2687G 2090888 041808 13:46

[cowley]

when my mode in the ERROR:512 status, it also can not recieve any SMS.

[awneil]

@cowley

AT+CMGS command, aways return the same ERROR code 512.

Is the modem correctly registered to the network?

[Manchine]

@awneil

Is the modem correctly registered to the network?

Or does your provider have SMS service enabled for your account?

[awneil]

@Manchine

does your provider have SMS service enabled for your account?

As previously noted, “+CMS ERROR:512” indicate ‘MM establishment failure’ - so it’s more likely to be something basic with the RF link than something “higher-level” like service options.

If it was a service restriction, I think you’d get some other error than “+CMS ERROR:512”

[cowley]

@awneil

@cowley

AT+CMGS command, aways return the same ERROR code 512.

Is the modem correctly registered to the network?

at+creg?
+CREG: 1,2

OK
according the stat 2 return,
it is not registered, ME currently searching for a new operator. how to do?

[cowley]

@Manchine

@awneil

Is the modem correctly registered to the network?

Or does your provider have SMS service enabled for your account?

before this ERROR, I can send SMS with the Q2687 modem, and I also can send SMS when I plug this SIM card into another Q2687 modem.

[cowley]

@awneil

@Manchine

does your provider have SMS service enabled for your account?

As previously noted, “+CMS ERROR:512” indicate ‘MM establishment failure’ - so it’s more likely to be something basic with the RF link than something “higher-level” like service options.

If it was a service restriction, I think you’d get some other error than “+CMS ERROR:512”

I check my Q2687 setting , it as following,
AT+CSCA?
+CSCA: “+6596197777”,145

OK
at+CNMI?
+CNMI: 2,1,1,2,0

OK
AT+CMGF?
+CMGF: 1

OK

do u thinks any other wrong？

[cowley]

@awneil

As previously noted, “+CMS ERROR:512” indicate ‘MM establishment failure’ - so it’s more likely to be something basic with the RF link than something “higher-level” like service options.

you mean these was a hardware problem or firmware exception? so now, it is not any good method to recover the modem, right?
should I flash the firmware?

I check the signal , it seems no problem, and can also connect network. the checking procedure as following,
at+csq
+CSQ: 11,0

OK
at+cops?
+COPS: 0,2,52501

OK
at+cind?
+CIND: 4,1,0,0,0,0,0

OK

[cowley]

Hi! Guys

I resolve the problem with WREGC command.

AT+WREGC=0
OK
#then check registed status
AT+CREG?
+CREG: 1,1

OK

now it is ok, Can send SMS successfully!

[awneil]

@cowley

I resolve the problem with WREGC command

I had to look that one up:

@AT Commands Manual

This Wavecom proprietary command is used by the application to disable GSM and GPRS registration and deregistration procedures on the network If the registration/deregistration procedure is disabled, the Wireless CPU® does not perform the procedure but considers itself as attached/detached on the network. The command +WREGC therefore has no impact on the response to AT+CREG?.

After the +WREGC mode is set to 1 (AT+WREGC=1), the Wireless CPU® enters the Spy Mode immediately. During the Spy Mode, MS is in IMSI detached state, for both GSM and GPRS, but keeps monitoring serving cell and all surrounding cells; only emergency call is allowed. Nevertheless, network registration can be achieved manually in a very short time (less than 1 second in most of the cases) once the Spy Mode is deactivated by the command AT+WREGC=0.

Which does, indeed, fit the symptoms described - an ‘MM establishment failure’ makes perfect sense!

[cowley]

Thank Awneil for your nice analysis conclusion!