GUI startup fixes if modem is not running

gui/src/js/api.js

@@ -6,12 +6,18 @@ function buildURL(params, endpoint) {
 }
 
 async function apiGet(endpoint) {
+  try  {
   const response = await fetch(buildURL(settings.local, endpoint));
   if (!response.ok) {
     throw new Error(`REST response not ok: ${response.statusText}`);
   }
   const data = await response.json();
   return data;
+  }   catch(error)  {
+    console.error("Error getting from REST:", error);
+  }
+
+
 }
 
 export async function apiPost(endpoint, payload = {}) {

gui/src/js/deviceFormHelper.ts

@@ -3,6 +3,15 @@ import { getAudioDevices, getSerialDevices } from "./api";
 let audioDevices = await getAudioDevices();
 let serialDevices = await getSerialDevices();
 
+//Dummy device data sent if unable to get devices from modem to prevent GUI crash
+const skel = JSON.parse(`
+  [{
+    "api": "MME",
+    "id": "0000",
+    "name": "No devices received from modem",
+    "native_index": 0
+}]`
+)
 export function loadAudioDevices() {
   getAudioDevices().then((devices) => {
     audioDevices = devices;
@@ -16,10 +25,18 @@ export function loadSerialDevices() {
 }
 
 export function audioInputOptions() {
+  if ((audioDevices === undefined))
+  {
+    return skel;
+  }
   return audioDevices.in;
 }
 
 export function audioOutputOptions() {
+  if ((audioDevices === undefined))
+  {
+    return skel;
+  }
   return audioDevices.out;
 }