tell device what protocol version we support when connected

src/connection/ble_connection.js

@@ -72,7 +72,7 @@ class BleConnection extends Connection {
         });
 
         // fire connected event
-        this.onConnected();
+        await this.onConnected();
 
     }
 

src/connection/connection.js

@@ -8,8 +8,18 @@ import RandomUtils from "../random_utils.js";
 
 class Connection extends EventEmitter {
 
-    onConnected() {
+    async onConnected() {
+
+        // tell device what protocol version we support
+        try {
+            await this.deviceQuery(Constants.SupportedCompanionProtocolVersion);
+        } catch(e) {
+            // ignore
+        }
+
+        // tell clients we are connected
         this.emit("connected");
+
     }
 
     onDisconnected() {
@@ -319,7 +329,7 @@ class Connection extends EventEmitter {
         } else if(responseCode === Constants.PushCodes.TraceData){
             this.onTraceDataPush(bufferReader);
         } else {
-            console.log("unhandled frame", frame);
+            console.log(`unhandled frame: code=${responseCode}`, frame);
         }
 
     }

src/connection/nodejs_serial_connection.js

@@ -22,8 +22,8 @@ class NodeJSSerialConnection extends SerialConnection {
             baudRate: 115200,
         });
 
-        this.serialPort.on("open", () => {
+        this.serialPort.on("open", async () => {
-           this.onConnected();
+           await this.onConnected();
         });
 
         this.serialPort.on("close", () => {

src/connection/tcp_connection.js

@@ -36,8 +36,8 @@ class TCPConnection extends Connection {
         });
 
         // connect to server
-        this.socket.connect(this.port, this.host, () => {
+        this.socket.connect(this.port, this.host, async () => {
-            this.onConnected();
+            await this.onConnected();
         });
 
     }

src/connection/web_serial_connection.js

@@ -17,8 +17,8 @@ class WebSerialConnection extends SerialConnection {
         });
 
         // fire connected callback after constructor has returned
-        setTimeout(() => {
+        setTimeout(async () => {
-            this.onConnected();
+            await this.onConnected();
         }, 0);
 
     }

src/constants.js

@@ -1,5 +1,7 @@
 class Constants {
 
+    static SupportedCompanionProtocolVersion = 1;
+
     static SerialFrameTypes = {
         Incoming: 0x3e, // ">"
         Outgoing: 0x3c, // "<"