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The thing is, I'm able to make the tcp connection and I can also get the AVL package successfully. The problem is that if I have more then one connection I'm not sure from which device I'm getting it because after the connection is made I don't receive the IMEI with the AVL package.

So how can I store in my database the IMEI from which I'm getting the AVL package. Please help!

Thanks in advance.

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Thank you for your query.

Before AVL package is sent Device sends his IMEI to server and server responds if IMEI is true(01) or false(00). This is an implementation part that IMEI with confirmation could be redirected to your database. Hope this will help. 

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