I use Java gcm-server to send messages to Android client applications, and I would like to send a message on a specific topic as shown here .
My problem is that I was able to send the message only using the Sender class to the register_ids list, and I cannot figure out how to use the "to" parameter: "/ themes / myTopic" (I read the source code and it seems that it doesnβt implemented).
Any tips?
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