diff --git a/package.json b/package.json
index cc1c9d2..9d9638f 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "build": "microbundle --no-compress",
     "watch": "microbundle watch",
     "devtools": "yarn build && node ./dist/cli.js devtools",
+    "devtools:serial": "yarn build && node ./dist/cli.js devtools --serial",
     "devtools:usb": "yarn build && node ./dist/cli.js devtools --usb",
     "test:usb": "yarn build && node ./dist/cli.js stream --usb --packets --sensors",
     "publish:pi": "yarn build && scp -r ../jacdac-ts/dist/* pi@192.168.0.131:/home/pi/gh/jacdac-cli/node_modules/jacdac-ts/dist && scp -r ./dist/* pi@192.168.0.131:/home/pi/gh/jacdac-cli/dist"
@@ -38,7 +39,7 @@
   "dependencies": {
     "commander": "^9.0.0",
     "faye-websocket": "^0.11.4",
-    "jacdac-ts": "^1.24.16"
+    "jacdac-ts": "^1.24.19"
   },
   "devDependencies": {
     "@semantic-release/exec": "^6.0.3",
diff --git a/src/devtools.ts b/src/devtools.ts
index a84abec..fa990ed 100644
--- a/src/devtools.ts
+++ b/src/devtools.ts
@@ -7,9 +7,11 @@ import {
     printPacket,
     serializeToTrace,
     createProxyBridge,
+    randomDeviceId,
 } from "jacdac-ts"
 import { createTransports, TransportsOptions } from "./transports"
 
+const SENDER_FIELD = "__jacdac_sender"
 /* eslint-disable @typescript-eslint/no-var-requires */
 const WebSocket = require("faye-websocket")
 const http = require("http")
@@ -77,9 +79,12 @@ export async function devToolsCommand(
     })
 
     // passive bus to sniff packets
-    const bridge = createProxyBridge(data =>
-        clients.forEach(c => c.send(Buffer.from(data)))
-    )
+    const bridge = createProxyBridge((data, sender) => {
+        //console.log(sender)
+        clients
+            .filter(c => c[SENDER_FIELD] !== sender)
+            .forEach(c => c.send(Buffer.from(data)))
+    })
     const transports = createTransports(options)
     const bus = new JDBus(transports, {
         client: false,
@@ -103,9 +108,11 @@ export async function devToolsCommand(
         // is this a socket?
         if (WebSocket.isWebSocket(request)) {
             const client = new WebSocket(request, socket, body)
-            const sender = Math.random() + ""
+            const sender = "ws" + randomDeviceId()
+            // store sender id to deduped packet
+            client[SENDER_FIELD] = sender
             clients.push(client)
-            log(`client: connected (${clients.length} clients)`)
+            log(`client: connected (${sender}, ${clients.length} clients)`)
             client.on("message", event => {
                 const { data } = event
                 clients.filter(c => c !== client).forEach(c => c.send(data))
@@ -117,7 +124,8 @@ export async function devToolsCommand(
     })
 
     const tcpServer = net.createServer(client => {
-        const sender = Math.random() + ""
+        const sender = "tcp" + randomDeviceId()
+        client[SENDER_FIELD] = sender
         client.send = (pkt0: Buffer) => {
             const pkt = new Uint8Array(pkt0)
             const b = new Uint8Array(1 + pkt.length)
@@ -132,7 +140,7 @@ export async function devToolsCommand(
             }
         }
         clients.push(client)
-        log(`client: connected (${clients.length} clients)`)
+        log(`client: connected (${sender} ${clients.length} clients)`)
         let acc: Uint8Array
         client.on("data", (buf: Uint8Array) => {
             if (acc) {
diff --git a/yarn.lock b/yarn.lock
index 3f53ed7..b5db119 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4024,10 +4024,10 @@ issue-parser@^6.0.0:
     lodash.isstring "^4.0.1"
     lodash.uniqby "^4.7.0"
 
-jacdac-ts@^1.24.16:
-  version "1.24.16"
-  resolved "https://registry.yarnpkg.com/jacdac-ts/-/jacdac-ts-1.24.16.tgz#e0fe156b7f84ca1dc9e384b6e457ee8c5d0454a7"
-  integrity sha512-h6flgQf5hCV+uzwARv9CxMBZ4xosvOqfSkR6Q0cPcjcO209idk23YIRBrgDU4SlZG9EX6FgCHzEZ/KvlCHZzRA==
+jacdac-ts@^1.24.19:
+  version "1.24.19"
+  resolved "https://registry.yarnpkg.com/jacdac-ts/-/jacdac-ts-1.24.19.tgz#c55883aa4af0d73db2a7ef3a4035bc4fa4a1fc15"
+  integrity sha512-wr9jzuPILKTIP2tV0CuNxCehHd4s89mohC4cmp4FXyesp4HpJ4XY8zCRZvwz8pG2Cd4GlvfDTj4PECUlKAWBrA==
   dependencies:
     "@types/node" "^17.0.17"
     "@types/w3c-web-serial" "^1.0.2"