# WP7702 sms receive is unstable **URL:** \ **Category:** mangOH Red\ **Created:** [June 2, 2021, 5:29am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274 "2021-06-02T05:29:19Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 5:29am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/1 "2021-06-02T05:29:19Z")
I have a Legato app running on WP7702 which can receive sms from cell phones, but it doesn’t work consistently. I had it working this afternoon, but now it stops decode incoming sms, the log displays the following: > Jun 1 22:23:08 swi-mdm9x28-wp user.info Legato: INFO | modemDaemon[1199]/modemDaemon T=main | smsPdu.c DecodeUserDataField() 1071 | messageLen 24, pos 29, size 24 > Jun 1 22:23:08 swi-mdm9x28-wp user.info Legato: INFO | avcDaemon[1149]/avcDaemon T=main | avcServer.c ProcessWakeupSms() 4359 | SMS is too short or doesn’t start with prefix ‘LWM2M’, ignoring Can anyone help? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [June 2, 2021, 5:35am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/2 "2021-06-02T05:35:33Z")
suggest you stopping your application and try CM tool first to monitor incoming SMS: cm sms monitor & ---
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 5:51am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/3 "2021-06-02T05:51:57Z")
I suspect it might because the sim on WP7702 is a French number(I locate in Canada though). Despite it had no problem to receive in the past, there is a terrible delay on SMS transmission… Is it possible I insert a local sim card on WP7702? * * * I might be wrong, I tried with cm sms monitor, it received instantly, but the app didn’t get it… because it didn’t print on the log ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [June 2, 2021, 6:15am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/4 "2021-06-02T06:15:51Z")
Then seems your app has problem ---
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 6:19am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/5 "2021-06-02T06:19:01Z")
Where can I find the sample code to receive sms? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [June 2, 2021, 6:20am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/6 "2021-06-02T06:20:22Z")
> ---
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 7:34am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/7 "2021-06-02T07:34:34Z")
Thank you!! However, what is the difference if I wrote it in this way: > static void RxMessageHandler > > ( > > ``` > le_sms_MsgRef_t msgRef, > > void* contextPtr > > ``` > > ) > > { > > ``` > le_result_t res; > > char text[LE_SMS_TEXT_MAX_BYTES] = {0}; > > if(!textReceived) { > > textReceived = true; > > LE_INFO("A New SMS message is received with ref.%p", msgRef); > > if (le_sms_GetFormat(msgRef) == LE_SMS_FORMAT_TEXT) > > { > > //get sender number > > res = le_sms_GetSenderTel(msgRef, tel, sizeof(tel)); > > if(res != LE_OK) > > { > > LE_ERROR("le_sms_GetSenderTel has failed (res.%d)!", res); > > } > > else > > { > > LE_INFO("Message is received from %s.", tel); > > } > > //get text content > > res = le_sms_GetText(msgRef, text, sizeof(text)); > > if(res != LE_OK) > > { > > LE_ERROR("le_sms_GetText has failed (res.%d)!", res); > > } > > else > > { > > res = le_sms_DeleteFromStorage(msgRef); > > if(res != LE_OK) > > { > > LE_ERROR("le_sms_DeleteFromStorage has failed (res.%d)!", res); > > } > > else > > { > > LE_INFO("the message has been successfully deleted from storage."); > > } > > le_sms_Delete(msgRef); > > LE_INFO("message object deleted from memory."); > > LE_INFO("Message content: \"%s\"", text); > } > } > > ``` > > } > > le\_result\_t sms\_Receiver > > ( > > ``` > void > > ``` > > ) > > { > > ``` > RxHdlrRef = le_sms_AddRxMessageHandler(RxMessageHandler, NULL); > > if (!RxHdlrRef) > > { > > LE_ERROR("le_sms_AddRxMessageHandler has failed!"); > > return LE_FAULT; > > } > > else > > { > > return LE_OK; > > } > > ``` > > } ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [June 2, 2021, 7:36am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/8 "2021-06-02T07:36:14Z")
does it work if you use the code in CM tool? ---
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 10:23pm UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/9 "2021-06-02T22:23:35Z")
It works, but not constantly stable. I pointed out in the previous reply, an incoming sms can be detected by `cm sms monitor`, but not always by the code ---
**Author:** ![jeremyzhang](https://avatars.discourse-cdn.com/v4/letter/j/4da419/32.png) [@jeremyzhang](https://mangoh.discourse.group/u/jeremyzhang)\ **Post date:** [June 2, 2021, 10:25pm UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/10 "2021-06-02T22:25:56Z")
I looked at the sample code you posted, I’m wondering how can I reset `smsType` and `format` on WP7702, I think by default they are `LE_SMS_TYPE_RX` and `LE_SMS_FORMAT_TEXT` ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [June 3, 2021, 12:02am UTC](https://mangoh.discourse.group/t/wp7702-sms-receive-is-unstable/9274/11 "2021-06-03T00:02:42Z")
do you mean you have ported the CM sample code to your application already, but it is not always working, and “cm sms monitor” is always working fine?