ble: add 1 second delay after connecting

This might help with some people that have connection issues where the
OS is still busy enumerating the device when we are trying to read
characteristics.

src/ble/sagas.ts

@@ -10,6 +10,7 @@ import { Task, buffers, eventChannel } from 'redux-saga';
 import {
     call,
     cancel,
+    delay,
     fork,
     put,
     select,
@@ -164,6 +165,12 @@ function* handleBleConnectPybricks(): Generator {
 
         defer.push(() => server.disconnect());
 
+        // istanbul ignore if
+        if (process.env.NODE_ENV !== 'test') {
+            // give OS Bluetooth stack some time to settle
+            yield* delay(1000);
+        }
+
         const deviceInfoService = yield* call(() =>
             server.getPrimaryService(deviceInformationServiceUUID).catch((err) => {
                 if (

src/lwp3-bootloader/sagas-ble.ts

@@ -4,7 +4,15 @@
 // Handles Bluetooth Low Energy connection to LEGO Wireless Protocol v3 Bootloader service.
 
 import { END, eventChannel } from 'redux-saga';
-import { call, cancel, put, spawn, takeEvery, takeMaybe } from 'typed-redux-saga/macro';
+import {
+    call,
+    cancel,
+    delay,
+    put,
+    spawn,
+    takeEvery,
+    takeMaybe,
+} from 'typed-redux-saga/macro';
 import { alertsShowAlert } from '../alerts/actions';
 import { ensureError } from '../utils';
 import {
@@ -99,6 +107,12 @@ function* handleConnect(): Generator {
         return;
     }
 
+    // istanbul ignore if
+    if (process.env.NODE_ENV !== 'test') {
+        // give OS Bluetooth stack some time to settle
+        yield* delay(1000);
+    }
+
     let service: BluetoothRemoteGATTService;
     try {
         service = yield* call([server, 'getPrimaryService'], lwp3BootloaderServiceUUID);