Add getWifiStatus function to allow checking for live wifi connection before

trying OTA Update

frontend/ui/networkmgr.lua

@@ -70,4 +70,13 @@ function NetworkMgr:promptWifiOff()
     })
 end
 
+function NetworkMgr:getWifiStatus()
+    local wifi_status = os.execute("ping -c3 8.8.8.8")
+    if wifi_status == 2 then
+        return false
+    else
+        return true
+    end
+end
+
 return NetworkMgr

frontend/ui/otamanager.lua

@@ -65,10 +65,6 @@ function OTAManager:checkUpdate()
         url = ota_zsync_file,
         sink = ltn12.sink.file(io.open(local_zsync_file, "w"))}
     -- prompt users to turn on Wifi if network is unreachable
-    if h == nil then
-        NetworkMgr:promptWifiOn()
-        return
-    end
     if c ~= 200 then return end
     -- parse OTA package version
     local ota_package = nil
@@ -143,6 +139,10 @@ function OTAManager:getOTAMenuTable()
             {
                 text = _("Check update"),
                 callback = function()
+                    if NetworkMgr:getWifiStatus() == false then
+                        NetworkMgr:promptWifiOn()
+                        return
+                    end 
                     local ota_version = OTAManager:checkUpdate()
                     if ota_version == 0 then
                         UIManager:show(InfoMessage:new{