Return firmware version in wifi connect response

This parallels the implementation of the serial channel, and meets the
expectation of the GUI which expects this field regardless of communications
medium.

This is a followup to #81, which resolved OpenBCI/OpenBCI_GUI#449 for serial
communications only.

Author: Brad Martin

src/background.js

@@ -1022,12 +1022,22 @@ const _connectWifi = (msg, client) => {
     .then(() => {
       //TODO: Finish this connect
       if (verbose) console.log("connect success");
+      if (wifi.getBoardType() == k.OBCIBoardGanglion) {
+        return Promise.resolve('');
+      } else {
+        // Query cyton firmware version to report in connect response.
+        return wifi.write('V');
+      }
+    })
+    .then((version) => {
       // client.write(`${kTcpCmdConnect},${kTcpCodeSuccess}${kTcpStop}`);
       writeCodeToClientOfType(
         client,
         kTcpTypeConnect,
         kTcpCodeSuccess,
-        {}
+        {
+          firmware: version.trim()
+        }
       );
       // wifi.on(k.OBCIEmitterRawDataPacket, console.log);
       wifi.on("sample", sampleFunction.bind(null, client));