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I have an array of Motorola Razar v3m's containg about 26 phones now. I have a multi-threaded software platform I built which manages each phone and message routing/timed-wait tasks and all of that.

When I issue:

AT+CMGW="1234567890"message<26><27>

It takes nearly 30 seconds to write the message to the phone memory, I then get send the message using:

AT+CMSS=messageIndex

and that takes another 30 seconds.

I have tried using AT+CMGS but can't get that functionality to send a message successfully at all.

I need this to be reliable, but with this method/phone combination, I wouldn't even depend on it to tell me Happy Birthday once a year.

Is there another way to send an SMS without storing it to memory first? Not only is it slow; but eventually causes the phone to no longer send messages at all, even if they are deleted after by AT+CMGD.

1 Answers1

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It sounds like the you are writing to the sim memory since it is so slow. From the description of AT+CMGW in 27.005:

Execution command stores message (either SMS-DELIVER or SMS-SUBMIT) to memory storage <mem2>.

and earlier in "3.1 Parameter definitions":

<mem1> string type; memory from which messages are read and deleted (commands List Messages +CMGL, Read Message +CMGR and Delete Message +CMGD); defined values (others are manufacturer specific):

"BM" broadcast message storage
"ME" ME message storage
"MT" any of the storages associated with ME
"SM" (U)SIM message storage
"TA" TA message storage
"SR" status report storage

<mem2> string type; memory to which writing and sending operations are made (commands Send Message from Storage +CMSS and Write Message to Memory +CMGW) ); refer for defined values

The value of <mem1> and <mem2> is configured with AT+CPMS, preferred message storage (notice you should set both to the same value). So my guess is that if you run AT+CPMS? it will return +CPMS: "SM", ..., ..., "SM", .... If my guess is correct you should just switch to another storage on the phone ("ME", "MT" or "TA" - check with AT+CPMG=? what it supports (and it might support additional storages compared to the standard)) which will be much faster that the sim storage.

Using AT+CMGS should be possible, but notice that you do need to wait for "\r\n> " before sending the payload. When you say you did not get that one to work I assume you had some trouble with regards to proper parsing of the responses and proper waiting.

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hlovdal
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  • I'll award you --- because you ARE correect, but in short, the answer was abandoning the Motorola Razr v3m phones -- they are too unreliable. They eventually just quit sending messages, and i have 70 phones I have tried. I eventually just built an Arduino with a GSM shield and coded it how I needed -- it sends texts in under a second. –  Apr 18 '17 at 07:00