Question in Firebase Mobile?

Hello All,

 In my project am using the Firebase Mobile to Send Receive Messages for the am using Chat Message(In App Chat) in Mobile. In My case I need to Send a Message to X person and the person should receive the Message." Here while am sending I will Show Double tick if receiver Receives it but if the receiver will not have the internet then I should Show only one tike Like (WhattsApp)". Now am showing double tick is receiver will not have internet any one help me out here to resolve this Issue..

Thanks in Advance,

Ramesh Pugazhenthi.

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