SMS text after lower case 'w' get lost in standard GSM library's SendSMS example

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1

I am using an SIM 900A GSM module with arduino Uno and this program given in GSM library example https://www.arduino.cc/en/Tutorial/GSMExamplesSendSMS. But if there is lower case 'w' in sms text, then sms is not completely received on receiver's phone. Text lost after w.

Screenshot_2019-05-14-16-53-52-955_com.android.mms.png
Screenshot_2019-05-14-16-53-52-955_com.android.mms.png720×1280 65.6 KB

2

This was previously reported here:

3

Yes, i see, but there is no solution given. How to resolve this?
Thanks for reply.

4

Probably a bug in that library. Your options:

  1. contact the author of that library, see if they have a solution.
  2. look carefully at the library and find out why it goes wrong - fork it and fix it.
  3. find another library for your GSM module.
5

The author of the library (Arduino) was notified of the issue three years ago. I wouldn't hold my breath waiting for Arduino to fix it, or even investigate, since the Arduino GSM Shields were retired long ago. Arduino is now focusing their efforts on the new MKRGSM library for the MKR GSM 1400.

I do think it would be great if someone fixed this bug and submitted a pull request to the arduino-libraries/GSM repository. I can't guarantee Arduino would actually merge that pull request, but any other user who had the same problem with the library would be able to easily find and download the fixed version of the library from your pull request.

6

pert:
the Arduino GSM Shields were retired long ago.

Understandable. I'm still wondering why I see the GSM900 so often. It's the older version of the GSM800, and both will be rather obsolete in a few years time as the 2G networks are being retired.

I have a few such modules myself, couldn't get them to work. They're really cheap compared to 3G/4G modules which are in comparison crazy expensive (like 10-20x the price), but on second thought I regret buying them simply because they will be obsolete and stop working pretty soon. They should currently be considered "not for new designs"!

7

wvmarle:
Understandable. I'm still wondering why I see the GSM900 so often. It's the older version of the GSM800, and both will be rather obsolete in a few years time as the 2G networks are being retired.

I have a few such modules myself, couldn't get them to work. They're really cheap compared to 3G/4G modules which are in comparison crazy expensive (like 10-20x the price), but on second thought I regret buying them simply because they will be obsolete and stop working pretty soon. They should currently be considered "not for new designs"!

I know a very little about this shields, but I think SMS will still work

8

I wonder how a 2G-only GSM module is going to connect at all to a 3G, 4G or 5G network...

9

wvmarle:
I wonder how a 2G-only GSM module is going to connect at all to a 3G, 4G or 5G network...

I just want to take SMS service from this GSM module.
Thank you everyone for reply.

10

sanjeev28693:
I just want to take SMS service from this GSM module.

If there's no more 2G network in your area you can't connect to a network in the first place. So also no SMS or other services.