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I created this python script on rpi2, the message goes through, but it is a blank message. Is it a encoding issue? 

import serial
import time
from sys import version_info
from curses import ascii
phone = serial.Serial("/dev/ttyAMA0", 115200, timeout=0.5)
def send_text(number,message):    
    phone.write(b'AT+CMGF=1\r')
    phone.write(b'AT+CMGS="' + number.encode() + b'"\r')
    phone.write(message.encode())
    phone.write(ascii.ctrl('z'))
    for i in range(len(reply)):
        reply[i] = reply[i].rstrip()
    print reply

AT commands (where 0000000000 is a 10 digit mobile number) in Minicom, still blank message

minicom -D /dev/ttyAMA0 -b 115200 -o

AT
OK
AT+CMGS="0000000000"
>Hello
 <ctrl-z>
+CMGS: 14
OK

Screenshot of Message from GSM Module

Arun K
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  • You are properly terminating the AT command line correctly with `\r`, good. But you should **never, never, ever use sleep as a substitute for waiting for the Final result code from the modem.** See [this answer](http://stackoverflow.com/a/33266839/23118) for details. Without fixing that you will never get any of your AT command code to behave reliably. – hlovdal Jul 01 '16 at 15:59
  • Ya thanks for that! Ill fix that code! Though the above problem was solved by this AT command `AT+CSMP=17,167,0,0` – Arun K Jul 01 '16 at 17:09

2 Answers2

3

There was an issue with the text mode parameters. The AT command below fixed it - 

AT+CSMP=17,167,0,0

--info about it
AT+CSMP=<fo>,<vp>,<pid>,<dcs>
<fo>=17 Sets reply pat, user data header, status report request, validity period format, reject duplicates and message type.
<vp>=167 Sets validity period.
<pid>=0 Higher layer protocol indicator.
<dcs>=0 Information encode format.
OK Modem Response.
Arun K
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  • Hi, what CSCS setting was used with this? I tried this, but it didn't work for me. This works if I send the data from a serial port utility, but not from the device firmware (Texas Instrument Launchpad). – WedaPashi Nov 30 '17 at 15:36
  • Thank you mate .. your answer helped me in another issue rather than the question it self. ^_^ – Leebeedev Feb 22 '21 at 09:30
0

AT+CSMP=17,167,0,0

Parameters Depending on the command or result code: first octet of GSM 03.40 SMS-DELIVER, SMS-SUBMIT (default 17),

SMS-STATUS-REPORT, or SMS-COMMAND (default 2) an integer format. SMS status report is supported under text mode if is set to 49.

Depending on SMS-SUBMIT setting: GSM 03.40 TP-Validity-Period either in integer format (default 167) or in time-string format (refer )

GSM 03.40 TP-Protocol-Identifier in integer format (default 0).

GSM 03.38 SMS Data Coding Scheme in Integer format.

Dhana Kumar
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