You may get the untrusted developer error message on the screen at times. It is because the EonHub app is unofficial and Apple doesn’t recognize it. Do not panic and do this. Note the developer's name from the error message. Open settings and go to General, then profiles. Now find the developer name and select it. Open the trust feature, close settings and the app will start working now. You can repeat the same steps for all apps to get rid of the developer error message.