The system is under the project Robotx in National Chiao Tung University (Taiwan). Robotx aimed to build an intelligent system for unmanned surface vehicles, and this backend system is responsible for receiving sensor data from vehicles through the MQTT protocol, as well as providing APIs for administrators to access data.

Important parts of the system include a web server with Flask (Python), Database (MySQL), and an MQTT broker.

Start Services

$ docker-compose up -d

Close Services

$ docker-compose down

Testing

$ docker-compose exec -e FLASK_APP=commands.py web flask test

DB migrations

$ docker-compose exec web flask db migrate -m "message"
$ docker-compose exec web flask db upgrade

• Event: image
• Size Limit: < 268435455 bytes (256 MB)
• File Name Limit: < 256 characters
• File Type: any
• Dest: Files or Images will be storaged in /images by default

Format

• File Name: File name with right-padding null characters. (256 chars)
• Image Size: Image size with right-padding null characters. (16 chars)
• File Content

Example

file_name_to_be_sent\0\0\0...\0 (<- total 256 chars)
107\0\0\0...\0 (<- total 16 chars)
\x89\x11\xa4...\x99

Testing

You can send files to the local mqtt broker with the test client:

$ docker-compose exec mqtt-recv python3 mqttrecv/test-sender.py images/test-tosend/example.png

This system is developed under Dr. Hsueh-Cheng Nick Wang's supervision. If you are intrested in this project, please contact [email protected] https://robotx-nctu.github.io/