Example MQTTSN network (Raspberry Pi and Arduino)

Example MQTT-SN network (Raspberry Pi + Arduino)

This project was made during Google Summer of Code 2014 - 'MQTT-SN implementation for Wiselib'

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Prerequisities

• Arduino board(minimum 128kB of flash, 256kB recommended)
• Raspberry Pi board
• Minimum 2 XBee S1 devices(API: 81)

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XBee configuration

XBee 1 (Gateway):

• MY: 1234
• AP: 2
• CH: 0C
• ID: 1111
• BD: 6 (56700 baud rate)
• CE: 1 (Coordinator)

XBee 2 (Client) :

• MY: 1235
• AP: 2
• CH: 0C
• ID: 1111
• BD: 6 (56700 baud rate)
• CE: 0 (End device)

XBee configuration tutorial

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Connections

• Arduino to XBee

  Arduino 3V3 - XBee Pin 1 (VCC)
  Arduino Ground - XBee Pin 10 (Ground)
  Arduino Tx - XBee Pin 3 (DIN)
  Arduino Rx - XBee Pin 2 (DOUT)

• Raspberry Pi to XBee

  RPi Pin 1 (3V3) - XBee Pin 1 (VCC)
  RPi Pin 6 (Ground) - Xbee Pin 10 (Ground)
  RPi Pin 8 (GPIO 14 Tx) - Xbee Pin 3 (DIN)
  RPi Pin 10 (GPIO 15 Rx) - Xbee Pin 2 (DOUT)

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If you are using your Raspberry Pi UART for the first time

1. Edit /boot/cmdline.txt

   sudo cp /boot/cmdline.txt /boot/cmdline.txt.bak // Backup sudo nano /boot/cmdline.txt

2. Remove all references to ttyAMA0

   /boot/cmdline.txt should look similiar to: dwc_otg.lpm_enable=0 rpitestmode=1 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait

3. Edit /etc/inittab

   sudo cp /etc/inittab /etc/inittab.bak // Backup sudo nano /etc/inittab

4. Comment out 2:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100 and any other references to ttyAMA0

5. Reboot Raspberry Pi

Note: If Raspberry UART seems not to work, install wiringPi. With this utility by using gpio <BCM-pin> mode <mode> command change mode of Rx and Tx pin to IN or OUT and then back to ALT0

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Installing Gateway on Raspberry Pi

1. Get MQTT-SN gateway code from https://github.com/lukaszdmitrowski/MQTT-SN.git

   git clone https://github.com/lukaszdmitrowski/MQTT-SN.git

2. Go inside gateway code

   cd MQTT-SN/Gateway

3. Install

   make
make install
make clean
cd ../../

4. To run type

   ./TomyGateway -i 1 -d /dev/ttyAMA0 -b 57600 -h test.mqtt.shiguredo.jp -p 1883

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Uploading Arduino client application

1. Go to example MQTT - SN client application in Wiselib library

   cd your_wiselib_dir/apps/generic_apps/mqttsn_test

2. As this is generic application compile it for Arduino platform (please remember about editing apps/generic_apps/Makefile.arduino and check/change: ARDUINO_PATH, ARDUINO_BOARD)

   make arduino

3. For uploading use avrdude(below example works with Arduino Mega2560, if you are not familiar with avrdude please check man avrdude)

   avrdude -V -p m2560 -c stk500v2 -b 115200 -Uflash:w:out/arduino/mqttsn_example_app.hex -P /dev/ttyACM0

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Start MQTT-SN network

1. Run MQTT-SN gateway application on Raspberry Pi.
2. Run Arduino MQTT-SN client application.
3. You can add more Arduino clients
4. You can write your own version of MQTT-SN client - MQTT-SN client implementation guide

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Project photos

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Łukasz Dmitrowski