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 (