Android Question Best Way To Communicate Between Multiple Android Devices

[Big Dave]

What is the best communication protocol to use between multiple android devices where they are in close proximity to each other. They would need to be able to transmit/receive data from any device. Please let me know if more information is needed. I have no real experience of communication protocols but ok at writing apps.

Thanks in advance.

 

[Cableguy]

BLE would be suitable, in a swarm configuration....

Take this as an example....

BLE (Bluetooth Low Energy) Peripheral

There are two types of devices involved in BLE communication: peripheral devices and central devices. Peripheral devices: heart rate monitors, beacons, Arduino with HM 10 module, etc. Central devices: Usually phones. Central devices connect to peripheral devices. BleManager type in both B4A...

www.b4x.com

 

[LucaMs]

https://www.b4x.com/android/forum/threads/b4xpages-bluetooth-chat-example.119014/#content

 

[amorosik]

The main problem with communicating with an Android device, usually a smartphone, is that if it's connected only to the cellular network, its address is hidden due to the very nature of the connection between the cell tower and the phone

I recently ran into this problem, and aside from polling the phone to a server, the only effective methods are two:
- Firebase
- Mqtt

In my case, I used a locally installed Mqtt server to enable communication between multiple Android smartphones, both on a LAN and connected via the cellular network.

Communication via Firebase is THE ONLY WAY to communicate with a smartphone even when the screen lock is activated.
In this case, there are no other ways to send messages and make the phone's onboard program react.
Therefore, the Mqtt (normal communication) + Firebase (hig priority message) combination, in my opinion, is the best way to communicate with Android devices.