Route selected CAN/J1939 traffic to UDP, TCP, or MQTT using @embedded32/ethernet transports - gateway pattern for connected-vehicle labs.
npm install @embedded32/bridge @embedded32/ethernet @embedded32/can @embedded32/j1939 @embedded32/core
Conceptual wiring (see package examples/ and supervisor config for full setup):
import { CanMqttBridge } from '@embedded32/bridge';
import { MQTTClient } from '@embedded32/ethernet';
import { CANInterface, MockCANDriver } from '@embedded32/can';
const can = new CANInterface(new MockCANDriver());
const mqtt = new MQTTClient({ broker: 'mqtt://localhost:1883' });
const bridge = new CanMqttBridge({
canBus: can,
mqtt,
topicPrefix: 'classroom/bus1',
});
await bridge.start();
Requires a local MQTT broker for live forwarding.
| Export | Role |
|---|---|
CanEthernetBridge |
CAN ↔ UDP/TCP forwarding with filters |
CanMqttBridge |
CAN ↔ MQTT topic mapping |
RuleEngine |
Priority rules, PGN whitelist/blacklist, rate limits |
BridgeRule, RoutingRule |
Configuration types |
@embedded32/ethernet for transportsNone when using MockCANDriver. Production gateways typically use Linux SocketCAN plus network access to MQTT/UDP peers.
Node.js only. MQTT consumers may be browser apps, but this package runs on the gateway host.
| Error | Fix |
|---|---|
| MQTT connection refused | Start broker (mosquitto) or fix broker URL |
| No forwarded messages | Check PGN whitelist and RuleEngine default action |
| Wrong import path | Use @embedded32/bridge, not legacy unscoped name |
@embedded32/ethernet - UDP, TCP, MQTT clients@embedded32/j1939 - PGN-aware filtering@embedded32/cli - load bridge via supervisor config@embedded32/bridge@1.0.0 (ESM) must pair with @embedded32/j1939@1.0.0 and @embedded32/ethernet@1.0.0.
MIT © Mukesh Mani Tripathi