Question 1

How to add a custom data converter to can2mqtt?

Accepted Answer

Copy the template from src/converter/mymode.rs, implement the Converter trait in Rust with towards_mqtt and towards_can methods, register it in all.rs, and use the mode name in your CSV config file.

Question 2

Can can2mqtt handle CAN FD frames or only standard CAN?

Accepted Answer

The README doesn't mention CAN FD support; it likely only handles standard CAN frames up to 8 bytes, so check the source code or issues for any FD extensions, but out-of-the-box, it's limited to basic CAN.

Question 3

What's the difference between can2mqtt and using SocketCAN tools directly with MQTT?

Accepted Answer

can2mqtt simplifies bridging by handling mapping and conversion automatically via CSV config, whereas SocketCAN tools require scripting for each message, making can2mqtt better for structured integrations but less flexible for raw data handling.

Question 4

How to debug can2mqtt if messages aren't flowing?

Accepted Answer

Use the -v flag for verbose output, and employ external tools like mosquitto_pub/sub for MQTT and cansend/candump from can-utils for CAN bus, as recommended in the debugging section.

Question 5

Is can2mqtt suitable for automotive OBD2 data integration?

Accepted Answer

Yes, if OBD2 data is transmitted over CAN bus; map the relevant CAN IDs to MQTT topics and use converters like uint322ascii for numeric data, but custom modes may be needed for specific OBD2 PIDs.

Question 6

What MQTT brokers are compatible with can2mqtt?

Accepted Answer

Any standard MQTT broker supporting TCP connections, such as Mosquitto or EMQX; specify the connection string with username and password in the command line, as shown in the usage example.

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