Android send lat/lang of one device to other App -

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hello have 2 different apps 'a' , 'b' installed on different devices. want send lat/lang of 1 device other using apps. how it? don't want use own server communication. how can this? in advance.

it not easy without own server, since ip address of clients not globally reachable, suggestions are:

  1. send email or sms
  2. use google cloud messaging
  3. give firebase try

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