Sending and Receiving between Raspberry pi 3 and Android

I’ve install Bleno in my raspberry pi 3, currently im able to send some plain text from android to raspberry pi 3, so how do i send some string back to Android ? Because I’ve tested with the callback function of onWriteRequest under new characteristic doesn’t work, or are there any ways to trigger the writing part?

echo.js onWriteRequest : function(data , offset, withoutResponse, callback) { this.value = data; ... if(this.value.toString == 'received_some_text_from_android') { // send plain text back to android } }

p/s: i’m very new to this, please bear with my false assumption

[newbielinuxuser]

Agree with the ping pong example, would be glad if there’s sample about it =D

[storm1er]

same problem, if someone can give us a real ping pong example, that could be awesome 😃