feat: add sparkplug b encoder

needs error handling

Author: ferm10n

app/src/actions/Publish.ts

@@ -3,6 +3,7 @@ import { AppState } from '../reducers'
 import { Base64Message } from '../../../backend/src/Model/Base64Message'
 import { Dispatch } from 'redux'
 import { makePublishEvent, rendererEvents } from '../../../events'
+import { Decoder } from '../../../backend/src/Model/Decoder'
 
 export const setTopic = (topic?: string): Action => {
   return {
@@ -47,6 +48,14 @@ export const publish = (connectionId: string) => (dispatch: Dispatch<Action>, ge
     retain: state.publish.retain,
     qos: state.publish.qos,
   }
+
+  if (
+    mqttMessage.payload &&
+    mqttMessage.topic.match(/spBv1\.0\/[^/]+\/(DDATA|NDATA|NCMD|DCMD|NBIRTH|DBIRTH|NDEATH|DDEATH\/[^/]+\/)/u)
+  ) {
+    mqttMessage.payload.decoder = Decoder.SPARKPLUG
+  }
+
   rendererEvents.emit(publishEvent, mqttMessage)
 }
 

backend/src/DataSource/MqttSource.ts

@@ -4,6 +4,8 @@ import { Client, connect as mqttConnect } from 'mqtt'
 import { DataSource, DataSourceStateMachine } from './'
 import { MqttMessage } from '../../../events'
 import { Base64Message } from '../Model/Base64Message'
+import { Decoder } from '../Model/Decoder'
+import { SparkplugEncoder } from '../Model/sparkplugb'
 
 export interface MqttOptions {
   url: string
@@ -47,7 +49,6 @@ export class MqttSource implements DataSource<MqttOptions> {
       throw error
     }
 
-
     const client = mqttConnect(url.toString(), {
       resubscribe: false,
       rejectUnauthorized: options.certValidation,
@@ -99,7 +100,12 @@ export class MqttSource implements DataSource<MqttOptions> {
 
   public publish(msg: MqttMessage) {
     if (this.client) {
-      this.client.publish(msg.topic, msg.payload ? Base64Message.toUnicodeString(msg.payload) : '', {
+      let payload: string | Buffer = msg.payload ? Base64Message.toUnicodeString(msg.payload) : ''
+      if (msg.payload?.decoder === Decoder.SPARKPLUG) {
+        payload = SparkplugEncoder.encode(payload) || payload
+      }
+
+      this.client.publish(msg.topic, payload, {
         qos: msg.qos,
         retain: msg.retain,
       })

backend/src/Model/sparkplugb.ts

@@ -22,3 +22,22 @@ export const SparkplugDecoder = {
     }
   }
 }
+
+export const SparkplugEncoder = {
+  encode(input: string): Buffer | undefined {
+    try {
+      console.log(input)
+      const payload = JSON.parse(input)
+      return Buffer.from(
+        SparkplugPayload.encode(
+          SparkplugPayload.create({
+            timestamp: Date.now(),
+            ...payload,
+          })
+        ).finish()
+      )
+    } catch (err) {
+      // todo ?
+    }
+  },
+}