add helper function for setting device time

index.html

@@ -255,7 +255,7 @@
             },
             async sendCommandSetDeviceTime() {
                 const timestamp = Math.floor(Date.now() / 1000);
-                await this.connection.sendCommandSetDeviceTime(timestamp);
+                await this.connection.setDeviceTime(timestamp);
             },
             async sendCommandSetTxPower() {
 

src/connection/connection.js

@@ -695,6 +695,37 @@ class Connection extends EventEmitter {
         });
     }
 
+    setDeviceTime(epochSecs) {
+        return new Promise(async (resolve, reject) => {
+            try {
+
+                // resolve promise when we receive ok
+                const onOk = (response) => {
+                    this.off(Constants.ResponseCodes.Ok, onOk);
+                    this.off(Constants.ResponseCodes.Err, onErr);
+                    resolve(response);
+                }
+
+                // reject promise when we receive err
+                const onErr = () => {
+                    this.off(Constants.ResponseCodes.Ok, onOk);
+                    this.off(Constants.ResponseCodes.Err, onErr);
+                    reject();
+                }
+
+                // listen for events
+                this.once(Constants.ResponseCodes.Ok, onOk);
+                this.once(Constants.ResponseCodes.Err, onErr);
+
+                // set device time
+                await this.sendCommandSetDeviceTime(epochSecs);
+
+            } catch(e) {
+                reject(e);
+            }
+        });
+    }
+
 }
 
 export default Connection;