diff --git a/app/src/actions/Publish.ts b/app/src/actions/Publish.ts
index 91130b4..a752251 100644
--- a/app/src/actions/Publish.ts
+++ b/app/src/actions/Publish.ts
@@ -2,7 +2,7 @@ import { Action, ActionTypes } from '../reducers/Publish'
 import { AppState } from '../reducers'
 import { Base64Message } from '../../../backend/src/Model/Base64Message'
 import { Dispatch } from 'redux'
-import { makePublishEvent, rendererEvents } from '../../../events'
+import { MqttMessage, makePublishEvent, rendererEvents } from '../../../events'
 
 export const setTopic = (topic?: string): Action => {
   return {
@@ -41,7 +41,7 @@ export const publish = (connectionId: string) => (dispatch: Dispatch<Action>, ge
   }
 
   const publishEvent = makePublishEvent(connectionId)
-  const mqttMessage = {
+  const mqttMessage: Partial<MqttMessage> = {
     topic,
     payload: state.publish.payload ? Base64Message.fromString(state.publish.payload) : null,
     retain: state.publish.retain,
diff --git a/app/src/components/Sidebar/Sidebar.tsx b/app/src/components/Sidebar/Sidebar.tsx
index f925c02..a24a981 100644
--- a/app/src/components/Sidebar/Sidebar.tsx
+++ b/app/src/components/Sidebar/Sidebar.tsx
@@ -1,10 +1,9 @@
 import * as q from '../../../../backend/src/Model'
 import React, { useState, useEffect, useCallback } from 'react'
-import ExpandMore from '@material-ui/icons/ExpandMore'
 import NodeStats from './NodeStats'
 import ValuePanel from './ValueRenderer/ValuePanel'
 import { AppState } from '../../reducers'
-import { Badge, ExpansionPanel, ExpansionPanelDetails, ExpansionPanelSummary, Typography } from '@material-ui/core'
+import { ExpansionPanelDetails } from '@material-ui/core'
 import { bindActionCreators } from 'redux'
 import { connect } from 'react-redux'
 import { settingsActions, sidebarActions } from '../../actions'
diff --git a/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx b/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
index a9d6ce8..d80814b 100644
--- a/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
+++ b/app/src/components/Sidebar/ValueRenderer/MessageHistory.tsx
@@ -65,7 +65,7 @@ export const MessageHistory: React.FC<Props> = props => {
   const history = node.messageHistory.toArray()
   let previousMessage: q.Message | undefined = node.message
   const historyElements = [...history].reverse().map((message, idx) => {
-    const value = node.message ? decodeMessage(node.message)?.format()[0] ?? null : null
+    const value = node.message ? decodeMessage(message)?.message?.format()[0] ?? null : null
 
     const element = {
       value: value ?? '',
@@ -96,7 +96,7 @@ export const MessageHistory: React.FC<Props> = props => {
     return element
   })
 
-  const value = node.message ? decodeMessage(node.message)?.format()[0] ?? null : null
+  const value = node.message ? decodeMessage(node.message)?.message?.format()[0] ?? null : null
 
   const isMessagePlottable = isPlottable(value)
   return (
diff --git a/app/src/components/Sidebar/ValueRenderer/ValuePanel.tsx b/app/src/components/Sidebar/ValueRenderer/ValuePanel.tsx
index 10a3020..61c5b2f 100644
--- a/app/src/components/Sidebar/ValueRenderer/ValuePanel.tsx
+++ b/app/src/components/Sidebar/ValueRenderer/ValuePanel.tsx
@@ -56,7 +56,7 @@ function ValuePanel(props: Props) {
   }
 
   const getDecodedValue = useCallback(() => {
-    return node?.message && decodeMessage(node.message)?.toUnicodeString()
+    return node?.message && decodeMessage(node.message)?.message?.toUnicodeString()
   }, [node, decodeMessage])
 
   function messageMetaInfo() {
diff --git a/app/src/components/Sidebar/ValueRenderer/ValueRenderer.tsx b/app/src/components/Sidebar/ValueRenderer/ValueRenderer.tsx
index 6addef4..f0b9196 100644
--- a/app/src/components/Sidebar/ValueRenderer/ValueRenderer.tsx
+++ b/app/src/components/Sidebar/ValueRenderer/ValueRenderer.tsx
@@ -1,12 +1,13 @@
 import * as q from '../../../../../backend/src/Model'
-import * as React from 'react'
+import React, { useMemo } from 'react'
 import CodeDiff from '../CodeDiff'
 import { AppState } from '../../../reducers'
 import { connect } from 'react-redux'
 import { ValueRendererDisplayMode } from '../../../reducers/Settings'
 import { Fade } from '@material-ui/core'
 import { Decoder } from '../../../../../backend/src/Model/Decoder'
-import { DecoderFunction, useDecoder } from '../../hooks/useDecoder'
+import { useDecoder } from '../../hooks/useDecoder'
+import { TopicViewModel } from '../../../model/TopicViewModel'
 
 interface Props {
   message: q.Message
@@ -15,86 +16,112 @@ interface Props {
   renderMode: ValueRendererDisplayMode
 }
 
-export const ValueRenderer: React.FC<Props> = props => {
-  const decodeMessage = useDecoder(props.treeNode)
+type Language = 'json'
 
-  function renderDiff(current: string = '', previous: string = '', title?: string, language?: 'json') {
-    return (
-      <CodeDiff
-        treeNode={props.treeNode}
-        previous={previous}
-        current={current}
-        title={title}
-        language={language}
-        nameOfCompareMessage={props.compareWith ? 'selected' : 'previous'}
-      />
-    )
-  }
+function renderDiff(
+  treeNode: q.TreeNode<TopicViewModel>,
+  compareWithPreviousMessage: boolean,
+  current: string = '',
+  previous: string = '',
+  title?: string,
+  language?: Language
+) {
+  return (
+    <CodeDiff
+      treeNode={treeNode}
+      previous={previous}
+      current={current}
+      title={title}
+      language={language}
+      nameOfCompareMessage={compareWithPreviousMessage ? 'selected' : 'previous'}
+    />
+  )
+}
 
-  function renderDiffMode(
-    decodeMessage: DecoderFunction,
-    message: q.Message,
-    treeNode: q.TreeNode<any>,
-    compare?: q.Message
+function renderDiffMode(
+  treeNode: q.TreeNode<TopicViewModel>,
+  currentStr: string | undefined,
+  compareStr: string | undefined,
+  currentType: Language | undefined,
+  compareType: Language | undefined,
+  compareWithPreviousMessage: boolean
+) {
+  const language = currentType === compareType && compareType === 'json' ? 'json' : undefined
+
+  return <div>{renderDiff(treeNode, compareWithPreviousMessage, currentStr, compareStr, undefined, language)}</div>
+}
+
+function renderRawMode(
+  treeNode: q.TreeNode<TopicViewModel>,
+  currentStr: string | undefined,
+  compareStr: string | undefined,
+  currentType: Language | undefined,
+  compareType: Language | undefined,
+  compareWithPreviousMessage: boolean
+) {
+  return (
+    <div>
+      {renderDiff(treeNode, compareWithPreviousMessage, currentStr, currentStr, undefined, currentType)}
+      <Fade in={Boolean(compareStr)} timeout={400}>
+        <div>
+          {Boolean(compareStr)
+            ? renderDiff(treeNode, compareWithPreviousMessage, compareStr, compareStr, 'selected', compareType)
+            : null}
+        </div>
+      </Fade>
+    </div>
+  )
+}
+
+export const ValueRenderer: React.FC<Props> = ({ treeNode, compareWith: compare, message, renderMode }) => {
+  const decodeMessage = useDecoder(treeNode)
+  const decodedMessage = useMemo(() => decodeMessage(message), [decodeMessage, message])
+
+  const previousMessages = treeNode.messageHistory.toArray()
+  const previousMessage = previousMessages[previousMessages.length - 2]
+  const compareMessage = compare || previousMessage || message
+  const compareWithPreviousMessage = !!compare
+
+  const [currentStr, currentType] = useMemo(
+    () => decodedMessage?.message?.format(treeNode.type) ?? [],
+    [decodedMessage, treeNode.type]
+  )
+  const [compareStr, compareType] = useMemo(
+    () => decodeMessage(compareMessage)?.message?.format(treeNode.type) ?? [],
+    [compareMessage, decodeMessage, treeNode.type]
+  )
+
+  function renderValue(
+    treeNode: q.TreeNode<TopicViewModel>,
+    currentStr: string | undefined,
+    compareStr: string | undefined,
+    currentType: Language | undefined,
+    compareType: Language | undefined,
+    renderMode: string,
+    compareWithPreviousMessage: boolean
   ) {
-    if (!message.payload) {
-      return
-    }
-
-    const previousMessages = treeNode.messageHistory.toArray()
-    const previousMessage = previousMessages[previousMessages.length - 2]
-    const compareMessage = compare || previousMessage || message
-
-    const [currentStr, currentType] = decodeMessage(message)?.format(treeNode.type) ?? []
-    const [compareStr, compareType] = decodeMessage(compareMessage)?.format(treeNode.type) ?? []
-
-    const language = currentType === compareType && compareType === 'json' ? 'json' : undefined
-
-    return <div>{renderDiff(currentStr, compareStr, undefined, language)}</div>
-  }
-
-  function renderRawMode(
-    decodeMessage: DecoderFunction,
-    message: q.Message,
-    treeNode: q.TreeNode<any>,
-    compare?: q.Message
-  ) {
-    if (!message.payload) {
-      return
-    }
-
-    const [currentStr, currentType] = decodeMessage(message)?.format(treeNode.type) ?? []
-    const [compareStr, compareType] =
-      compare && compare.payload ? decodeMessage(compare)?.format(treeNode.type) ?? [] : []
-
-    return (
-      <div>
-        {renderDiff(currentStr, currentStr, undefined, currentType)}
-        <Fade in={Boolean(compareStr)} timeout={400}>
-          <div>{Boolean(compareStr) ? renderDiff(compareStr, compareStr, 'selected', compareType) : null}</div>
-        </Fade>
-      </div>
-    )
-  }
-
-  function renderValue(decodeMessage: DecoderFunction) {
-    const { message, treeNode, compareWith, renderMode } = props
-    if (!message.payload) {
+    if (!decodedMessage) {
       return null
     }
 
     switch (renderMode) {
       case 'diff':
-        return renderDiffMode(decodeMessage, message, treeNode, compareWith)
+        return renderDiffMode(treeNode, currentStr, compareStr, currentType, compareType, compareWithPreviousMessage)
       default:
-        return renderRawMode(decodeMessage, message, treeNode, compareWith)
+        return renderRawMode(treeNode, currentStr, compareStr, currentType, compareType, compareWithPreviousMessage)
     }
   }
 
+  const renderedValue = useMemo(
+    () =>
+      renderValue(treeNode, currentStr, compareStr, currentType, compareType, renderMode, compareWithPreviousMessage),
+    [treeNode, currentStr, compareStr, currentType, compareType, renderMode, compareWithPreviousMessage]
+  )
+
   return (
     <div style={{ padding: '0px 0px 8px 0px', width: '100%' }}>
-      {props.message?.payload?.decoder === Decoder.SPARKPLUG && 'Decoded SparkplugB'}
-      {renderValue(decodeMessage)}
+      {decodedMessage?.decoder === Decoder.SPARKPLUG && 'Decoded SparkplugB'}
+      {renderedValue}
     </div>
   )
 }
diff --git a/app/src/components/TopicPlot.tsx b/app/src/components/TopicPlot.tsx
index 61f6014..780c983 100644
--- a/app/src/components/TopicPlot.tsx
+++ b/app/src/components/TopicPlot.tsx
@@ -30,7 +30,7 @@ function filterUsingTimeRange(startTime: number | undefined, data: Array<q.Messa
 function nodeToHistory(decodeMessage: DecoderFunction, startTime: number | undefined, history: q.MessageHistory) {
   return filterUsingTimeRange(startTime, history.toArray())
     .map((message: q.Message) => {
-      const decoded = decodeMessage(message)?.toUnicodeString()
+      const decoded = decodeMessage(message)?.message?.toUnicodeString()
       return { x: message.received.getTime(), y: toPlottableValue(decoded) }
     })
     .filter(data => !isNaN(data.y as any)) as any
@@ -46,7 +46,7 @@ function nodeDotPathToHistory(
     .map((message: q.Message) => {
       let json: any = {}
       try {
-        const decoded = decodeMessage(message)
+        const decoded = decodeMessage(message)?.message
         json = decoded ? JSON.parse(decoded.toUnicodeString()) : {}
       } catch (ignore) {}
 
diff --git a/app/src/components/Tree/TreeNode/TreeNodeTitle.tsx b/app/src/components/Tree/TreeNode/TreeNodeTitle.tsx
index cc60394..2dd5474 100644
--- a/app/src/components/Tree/TreeNode/TreeNodeTitle.tsx
+++ b/app/src/components/Tree/TreeNode/TreeNodeTitle.tsx
@@ -32,7 +32,7 @@ export const TreeNodeTitle = (props: TreeNodeProps) => {
     if (!props.treeNode.message || !props.treeNode.message.payload) {
       return ''
     }
-    const [value = ''] = decodeMessage(props.treeNode.message)?.format(props.treeNode.type) ?? []
+    const [value = ''] = decodeMessage(props.treeNode.message)?.message?.format(props.treeNode.type) ?? []
 
     return value.length > limit ? `${value.slice(0, limit)}…` : value
   }
diff --git a/app/src/components/hooks/useDecoder.ts b/app/src/components/hooks/useDecoder.ts
index 4a3d6c5..7c4668c 100644
--- a/app/src/components/hooks/useDecoder.ts
+++ b/app/src/components/hooks/useDecoder.ts
@@ -1,11 +1,12 @@
 import * as q from '../../../../backend/src/Model'
 import { useCallback, useState } from 'react'
 import { TopicViewModel } from '../../model/TopicViewModel'
-import { Base64Message } from '../../../../backend/src/Model/Base64Message'
 import { useSubscription } from './useSubscription'
 import { useViewModel } from '../Tree/TreeNode/effects/useViewModel'
+import { DecoderEnvelope } from '../../decoders/DecoderEnvelope'
+import { Decoder } from '../../../../backend/src/Model/Decoder'
 
-export type DecoderFunction = (message: q.Message) => Base64Message | null
+export type DecoderFunction = (message: q.Message) => DecoderEnvelope | undefined
 
 /**
  * Provides the latest decoder for a topic
@@ -21,7 +22,9 @@ export function useDecoder(treeNode: q.TreeNode<TopicViewModel> | undefined): De
 
   return useCallback(
     message => {
-      return decoder && message.payload ? decoder.decoder.decode(message.payload, decoder.format) : message.payload
+      return decoder && message.payload
+        ? decoder.decoder.decode(message.payload, decoder.format)
+        : { message: message.payload ?? undefined, decoder: Decoder.NONE }
     },
     [decoder]
   )
diff --git a/app/src/decoders/BinaryDecoder.ts b/app/src/decoders/BinaryDecoder.ts
index e558c56..b204cba 100644
--- a/app/src/decoders/BinaryDecoder.ts
+++ b/app/src/decoders/BinaryDecoder.ts
@@ -1,4 +1,6 @@
 import { Base64Message } from '../../../backend/src/Model/Base64Message'
+import { Decoder } from '../../../backend/src/Model/Decoder'
+import { DecoderEnvelope } from './DecoderEnvelope'
 import { MessageDecoder } from './MessageDecoder'
 
 type BinaryFormats =
@@ -18,7 +20,7 @@ type BinaryFormats =
  */
 export const BinaryDecoder: MessageDecoder<BinaryFormats> = {
   formats: ['int8', 'int16', 'int32', 'int64', 'uint8', 'uint16', 'uint32', 'uint64', 'float', 'double'],
-  decode(input: Base64Message, format: BinaryFormats): Base64Message {
+  decode(input: Base64Message, format: BinaryFormats): DecoderEnvelope {
     const decodingOption = {
       int8: [Buffer.prototype.readInt8, 1],
       int16: [Buffer.prototype.readInt16LE, 2],
@@ -37,12 +39,18 @@ export const BinaryDecoder: MessageDecoder<BinaryFormats> = {
     const buf = input.toBuffer()
     let str: String[] = []
     if (buf.length % bytesToRead !== 0) {
-      return new Base64Message(undefined, 'Data type does not align with message')
+      return {
+        error: 'Data type does not align with message',
+        decoder: Decoder.NONE,
+      }
     }
     for (let index = 0; index < buf.length; index += bytesToRead) {
       str.push((readNumber as any).apply(buf, [index]).toString())
     }
 
-    return Base64Message.fromString(JSON.stringify(str.length === 1 ? str[0] : str))
+    return {
+      message: Base64Message.fromString(JSON.stringify(str.length === 1 ? str[0] : str)),
+      decoder: Decoder.NONE,
+    }
   },
 }
diff --git a/app/src/decoders/DecoderEnvelope.ts b/app/src/decoders/DecoderEnvelope.ts
new file mode 100644
index 0000000..c15fa4f
--- /dev/null
+++ b/app/src/decoders/DecoderEnvelope.ts
@@ -0,0 +1,8 @@
+import { Base64Message } from '../../../backend/src/Model/Base64Message'
+import { Decoder } from '../../../backend/src/Model/Decoder'
+
+export interface DecoderEnvelope {
+  message?: Base64Message
+  error?: string
+  decoder: Decoder
+}
diff --git a/app/src/decoders/MessageDecoder.ts b/app/src/decoders/MessageDecoder.ts
index d5f2ef6..dc96ef6 100644
--- a/app/src/decoders/MessageDecoder.ts
+++ b/app/src/decoders/MessageDecoder.ts
@@ -1,4 +1,5 @@
 import { Base64Message } from '../../../backend/src/Model/Base64Message'
+import { DecoderEnvelope } from './DecoderEnvelope'
 
 export interface MessageDecoder<T = string> {
   /**
@@ -8,5 +9,5 @@ export interface MessageDecoder<T = string> {
   formats: T[]
   canDecodeTopic?(topic: string): boolean
   canDecodeData?(data: Base64Message): boolean
-  decode(input: Base64Message, format: T | string | undefined): Base64Message
+  decode(input: Base64Message, format: T | string | undefined): DecoderEnvelope
 }
diff --git a/app/src/decoders/SparkplugBDecoder.ts b/app/src/decoders/SparkplugBDecoder.ts
index d6e3f88..b5bedbd 100644
--- a/app/src/decoders/SparkplugBDecoder.ts
+++ b/app/src/decoders/SparkplugBDecoder.ts
@@ -9,7 +9,7 @@ export const SparkplugDecoder: MessageDecoder = {
   canDecodeTopic(topic: string) {
     return !!topic.match(/^spBv1\.0\/[^/]+\/[ND](DATA|CMD|DEATH|BIRTH)\/[^/]+(\/[^/]+)?$/u)
   },
-  decode(input: Base64Message): Base64Message {
+  decode(input) {
     try {
       const message = Base64Message.fromString(
         JSON.stringify(
@@ -17,12 +17,12 @@ export const SparkplugDecoder: MessageDecoder = {
           sparkplug.decodePayload(new Uint8Array(input.toBuffer()))
         )
       )
-      message.decoder = Decoder.SPARKPLUG
-      return message
+      return { message, decoder: Decoder.SPARKPLUG }
     } catch {
-      const message = new Base64Message(undefined, 'Failed to decode sparkplugb payload')
-      message.decoder = Decoder.NONE
-      return message
+      return {
+        error: 'Failed to decode sparkplugb payload',
+        decoder: Decoder.NONE,
+      }
     }
   },
 }
diff --git a/app/src/decoders/StringDecoder.ts b/app/src/decoders/StringDecoder.ts
index 0c3706f..f586bb7 100644
--- a/app/src/decoders/StringDecoder.ts
+++ b/app/src/decoders/StringDecoder.ts
@@ -1,9 +1,10 @@
 import { Base64Message } from '../../../backend/src/Model/Base64Message'
+import { Decoder } from '../../../backend/src/Model/Decoder'
 import { MessageDecoder } from './MessageDecoder'
 
 export const StringDecoder: MessageDecoder = {
   formats: ['string'],
-  decode(input: Base64Message): Base64Message {
-    return input
+  decode(input: Base64Message) {
+    return { message: input, decoder: Decoder.NONE }
   },
 }
diff --git a/backend/src/DataSource/MqttSource.ts b/backend/src/DataSource/MqttSource.ts
index 87c3db6..bd55b6f 100644
--- a/backend/src/DataSource/MqttSource.ts
+++ b/backend/src/DataSource/MqttSource.ts
@@ -98,7 +98,7 @@ export class MqttSource implements DataSource<MqttOptions> {
 
   public publish(msg: MqttMessage) {
     if (this.client) {
-      this.client.publish(msg.topic, msg.payload?.toBuffer() ?? '', {
+      this.client.publish(msg.topic, (msg.payload && new Base64Message(msg.payload))?.toBuffer() ?? '', {
         qos: msg.qos,
         retain: msg.retain,
       })
diff --git a/backend/src/Model/Base64Message.ts b/backend/src/Model/Base64Message.ts
index 4ab6d56..096f555 100644
--- a/backend/src/Model/Base64Message.ts
+++ b/backend/src/Model/Base64Message.ts
@@ -1,20 +1,42 @@
 import { Base64 } from 'js-base64'
-import { Decoder } from './Decoder'
 import { TopicDataType } from './TreeNode'
 
+export type Base64MessageDTO = Pick<Base64Message, 'base64Message'>
+
 export class Base64Message {
   public base64Message: string
-  private unicodeValue: string
-  public error?: string
-  public decoder: Decoder
-  public length: number
+  private _unicodeValue: string | undefined
 
-  constructor(base64Str?: string, error?: string) {
-    this.base64Message = base64Str ?? ''
-    this.error = error
-    this.unicodeValue = Base64.decode(base64Str ?? '')
-    this.length = base64Str?.length ?? 0
-    this.decoder = Decoder.NONE
+  // Todo: Rename to `encodedLength`
+  public get length(): number {
+    return this.base64Message.length
+  }
+
+  private get unicodeValue(): string {
+    if (!this._unicodeValue) {
+      this._unicodeValue = Base64.decode(this.base64Message ?? '')
+    }
+
+    return this._unicodeValue
+  }
+
+  constructor(base64Str?: string | Base64MessageDTO, error?: string) {
+    if (typeof base64Str === 'string' || typeof base64Str === 'undefined') {
+      this.base64Message = base64Str ?? ''
+    } else {
+      if (typeof base64Str.base64Message !== 'string') {
+        throw new Error('Received unexpected type in copy constructor')
+      }
+      this.base64Message = base64Str.base64Message
+    }
+  }
+
+  /**
+   * Override default JSON serialization behavior to only return the DTO
+   * @returns
+   */
+  public toJSON(): Base64MessageDTO {
+    return { base64Message: this.base64Message }
   }
 
   public toUnicodeString() {
diff --git a/backend/src/Model/ChangeBuffer.ts b/backend/src/Model/ChangeBuffer.ts
index 018e5ba..4310c73 100644
--- a/backend/src/Model/ChangeBuffer.ts
+++ b/backend/src/Model/ChangeBuffer.ts
@@ -15,7 +15,7 @@ export class ChangeBuffer {
   public push(val: MqttMessage) {
     if (!this.isFull()) {
       this.buffer.push({ message: val, received: new Date() })
-      this.size += this.estimatedMessageOverhead + (val.payload ? val.payload.length : 0)
+      this.size += this.estimatedMessageOverhead + (val.payload?.base64Message.length ?? 0)
       this.length += 1
     }
   }
diff --git a/backend/src/Model/Message.ts b/backend/src/Model/Message.ts
index 5b94304..556861f 100644
--- a/backend/src/Model/Message.ts
+++ b/backend/src/Model/Message.ts
@@ -1,7 +1,8 @@
 import { Base64Message } from './Base64Message'
 import { QoS } from '../DataSource/MqttSource'
+import { MemoryConsumptionExpressedByLength } from './RingBuffer'
 
-export interface Message {
+export interface Message extends MemoryConsumptionExpressedByLength {
   // mqtt based info
   payload: Base64Message | null
   messageId?: number
diff --git a/backend/src/Model/TreeNodeFactory.ts b/backend/src/Model/TreeNodeFactory.ts
index 82faa2a..752bc24 100644
--- a/backend/src/Model/TreeNodeFactory.ts
+++ b/backend/src/Model/TreeNodeFactory.ts
@@ -32,7 +32,7 @@ export abstract class TreeNodeFactory {
     node.setMessage({
       ...mqttMessage,
       payload: mqttMessage.payload && new Base64Message(mqttMessage.payload?.base64Message),
-      length: mqttMessage.payload?.length ?? 0,
+      length: mqttMessage.payload?.base64Message.length ?? 0,
       received: receiveDate,
       messageNumber: this.messageCounter,
     })
diff --git a/events/Events.ts b/events/Events.ts
index 69ce954..418652b 100644
--- a/events/Events.ts
+++ b/events/Events.ts
@@ -1,4 +1,4 @@
-import { Base64Message } from '../backend/src/Model/Base64Message'
+import { Base64MessageDTO } from '../backend/src/Model/Base64Message'
 import { DataSourceState, MqttOptions } from '../backend/src/DataSource'
 import { UpdateInfo } from 'builder-util-runtime'
 import { RpcEvent } from './EventSystem/Rpc'
@@ -32,7 +32,7 @@ export const updateAvailable: Event<UpdateInfo> = {
 
 export interface MqttMessage {
   topic: string
-  payload: Base64Message | null
+  payload: Base64MessageDTO | null
   qos: 0 | 1 | 2
   retain: boolean
   // Set if QoS is > 0 on received messages