Android Question Connecting and Sending Bluetooth commands

[moster67]

I have never programmed with Bluetooth. I have seen many examples here on the forum (I have seen code how to intercept but not for sending) although I think I did not find anything what I want to do but as I said, I am new to this so I may very well have not understood the related discussions.

Basically, I want to write an app which emulates the physical remote-control present on a headset. For instance, from my android app, I want to send bluetooth commands to another android phone (paired with each other) which would permit for instance increasing/decreasing volume, changing song in playlist, opening a phone call etc on the other android phone.

I guess what I want to know is how I should communicate over bluetooth, what protocol shall I use. The sending android phone has IceCream Sandwich (cannot be upgraded). Is the BLE library relevant but it seems it does not support IceCream Sandwich?

Any help or link for an example would be appreciated.
Thanks.

 

[DonManfred]

Is the BLE library relevant

https://developer.android.com/guide/topics/connectivity/bluetooth-le.html
BLE is added to Android in 4.3

Bluetooth Low Energy API. Android 4.3 (API level 18) introduces built-in platform support for Bluetooth Low Energy (BLE) in the central role

i guess you should use Bluetooth

 

[moster67]

Then I guess BLE is not possible since the app will run on an IceCream Sandwich device..
Maybe someone else has some information what approach I need to take..

 

[Erel]

You cannot emulate a headset with an Android device. The only Bluetooth profile accessible for developers is the SPP profile (serial port profile).
You can create an app that is installed on both devices and then communicates between them. It is pretty simple.

 

[moster67]

Oops, I was not aware of this.
I will study this and the SPP profile further.