In Digital Marketing Strategy, email and SMS are the important tools to improve your customer services. And Raspberry Pi is a good platform to help us to implement sending email or SMS.
In this weekend, I try to send SMS from Raspberry Pi with USB 3G, and i was successful. I used a Raspberry Pi 2 model B, and a USB 3G (I am in Vietnam, so I bought a Viettel USB 3G).
Send SMS with Raspberry Pi and USB 3G Viettel
At the first step, plug USB 3G in Raspberry Pi, and restart Pi.
From the terminal, type lsusb command:
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pi@raspberrypi ~/Projects/sms $ lsusb Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. Bus 001 Device 006: ID 19d2:0108 ZTE WCDMA Technologies MSM Bus 001 Device 004: ID 062a:4101 Creative Labs |
And using dmesg command, find ttyUSB:
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i@raspberrypi ~/Projects/sms $ dmesg|grep ttyUSB [ 18.738390] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0 [ 18.739859] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1 [ 18.740816] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2 [ 18.741821] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3 |
If you see the output above, it means that USB 3G connection is correct.
Now, we need to install a software to help us connect to serial port ttyUSB. That software is picocom:
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sudo apt-get install picocom |
After that, try to connect ttyUSB1 with command:
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picocom /dev/ttyUSB1 -b 115200 -l |
If you see the output has “terminal ready” and you try to type “AT” and receive the response “OK”. It means that your connection is prefect. Now, you type “AT+CMFG=1” to change to “text mode”
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AT+CMGF? displays current mode AT+CMGF=1 sets text mode AT+CMGF=0 sets PDU mode |
And try to send a SMS message with command:
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AT+CMGS="phonenumber"<CR>the message to send<Ctrl+z> |
Finally, press Ctrl + a + x to exit picocom terminal.
If you send SMS successfully with picocom. And now, we write a Python script to send SMS message. You can see the source code below. It is so simple.
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import serial def send_text(number, text, path='/dev/ttyUSB1'): ser = serial.Serial(path, timeout=1) # set text mode ser.write('AT+CMGF=%d\r' % 1) # set number ser.write('AT+CMGS="%s"\r' % number) # send message ser.write('%s\x1a' % text) print ser.readlines() ser.close() send_text('098xxxxxx', 'hey how are you?') |
To build a high performance SMS sender, we should apply Redis Pub/Sub to push all messages need to send to Queue.
Good luck!
