From a613e9956d88d1958d2929d56685454895b1b1ba Mon Sep 17 00:00:00 2001
From: Antonio Lain <antlai@cafjs.com>
Date: Fri, 27 May 2022 14:01:57 -0700
Subject: [PATCH] Fix for #131

---
 src/poweredup-browser.ts | 4 ++--
 src/webbleabstraction.ts | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/poweredup-browser.ts b/src/poweredup-browser.ts
index bd19561..9c81a69 100644
--- a/src/poweredup-browser.ts
+++ b/src/poweredup-browser.ts
@@ -130,9 +130,9 @@ export class PoweredUP extends EventEmitter {
 
 
     private _determineLPF2HubType (device: IBLEAbstraction): Promise<Consts.HubType> {
-        return new Promise((resolve) => {
+        return new Promise(async (resolve) => {
             let buf: Buffer = Buffer.alloc(0);
-            device.subscribeToCharacteristic(Consts.BLECharacteristic.LPF2_ALL, (data: Buffer) => {
+            await device.subscribeToCharacteristic(Consts.BLECharacteristic.LPF2_ALL, (data: Buffer) => {
                 buf = Buffer.concat([buf, data]);
                 while (buf[0] <= buf.length) {
                     const len = buf[0];
diff --git a/src/webbleabstraction.ts b/src/webbleabstraction.ts
index 09a359d..9e09275 100644
--- a/src/webbleabstraction.ts
+++ b/src/webbleabstraction.ts
@@ -85,7 +85,7 @@ export class WebBLEDevice extends EventEmitter implements IBLEAbstraction {
     }
 
 
-    public subscribeToCharacteristic (uuid: string, callback: (data: Buffer) => void) {
+    public subscribeToCharacteristic (uuid: string, callback: (data: Buffer) => void): Promise<any> {
         if (this._listeners[uuid]) {
             this._characteristics[uuid].removeEventListener("characteristicvaluechanged", this._listeners[uuid]);
         }
@@ -108,7 +108,7 @@ export class WebBLEDevice extends EventEmitter implements IBLEAbstraction {
             callback(data);
         }
 
-        this._characteristics[uuid].startNotifications();
+        return this._characteristics[uuid].startNotifications();
     }