very difficult for continued operation. when you have multiple devices already connected to your device through Bluetooth, you have to shut the rest off to utilize the intercom. I imagine that this app had great promise in the conception phase. Hopefully in the future it will work well for others...
Developer reply
Thanks for the detailed feedback. The app is improving with each update. It sounds like you had trouble switching between Bluetooth speakers. I will look into this issue. The app also works with Google Cast devices and other phones that have the app installed. However the devices must be connected to the same local Wi-Fi network.