In task 1, there are 3 script named device_1.py, device_2.py, device_3.py. The communication between the python script using MQTT. device_1 connected to arduino throuch serial communication. device_1 also act like a server, the device_1 subscribe to topic :
- registration/enter
- registration/exit
- power/on
- power/off
device_2 and device_3 act like a client, these two device publish a message through those topic above with payload containing device_id.
The Arduino flashed with this source_code to check the message and send back the message with command_id = 0x0c. The message template that used on serial communication between arduino and device_1:
| name | value | size |
|---|---|---|
| Start byte | 0xff |
1 bytes |
| Command_id | ( 0x0E = registration, 0x0B = controller, 0x0C = reply from arduino ) |
1 bytes |
| Length | example = 0x02 (lenght of following payload) |
1 bytes |
| Payload | example = 0x02, 0x01(device_id, value) |
lenght bytes |
| CRC8 | example = 0xf4 (checksum) |
1 bytes |
| End byte | 0x00 |
1 bytes |
Video Demonstration :
