api - Send data between two android devices over internet without using any intermediate server -

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i working on android application, in need transfer data between 2 android devices on internet connection without using intermediate server. sugession provided task follows :

  1. using socket programming

    if use approach, there possibility of changing ip address when device reconnect network.

  2. using sip2peer api

    it seems option, documents of api not clear, not able understand , run android example, if having experience api , please provide me hint of using in android, not getting need maintain server using api or not.

please provide me hint, how can achieve task.


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