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Editorial Team
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Asked: 2026-06-04T14:33:57+00:00

I am writing application in nodejs for sending and recieving sms in PDU mode.I

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I am writing application in nodejs for sending and recieving sms in PDU mode.I use wavecom GSM modem(7-bit encoding) to send sms. It also support 8 bit(AT+CSMP=1,167,0,8) encoding scheme.

I can send alpha numeric character properly.But I can’t send some character like ([,],| etc).

Here string :

AT+CMGS=14    
0001030C911989890878800004015B

Text String : [

But I recieve some junk character. Any Idea?

And how to send multipart sms. I have refer this, and this but I does not get desired output. can anyone suggest 8-bit(7-bit encoding scheme) text encoding scheme?
Please Help me…

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1 Answer

  1. Editorial Team

    Thanks,

    Finally I got the answer 🙂

    This characters([,],|) are encode as two characters like

    [ is encode as 1B1E (Combination of escape character and < sign)

    ] is encode as 1B20 (Combination of escap character and > sign)

    So whenever I fond such characters I replaced it with corresponding value then I use 7 bit encoding. It’s Work good…

    So my encoding string for [ is

    > AT+CMGS=15
> 0001000C911989890878800000021B1E

    And for “[hello]”

    > AT+CMGS=21
> 0001000C911989890878800000091B1EBACC66BF373E

    Thanks once again..

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