Question

I am using Google Cloud Messaging to provide push notifications. I may need to send a broadcast notification to around 10.000 users. However, I read that a Multicast message can contain a list with 1000 registration ids, maximun.

So, do I need to send ten multicast messages? Is there any way to send a broadcast to all the clients without generating the lists with all the ids?

thanks in advace.

Answer 1

You have no choice but splitting your broadcast in chunks of maximum 1000 regIds.

You can then send your multicast messages in separate threads.

        //regIdList max size is 1000
        MulticastResult multicastResult;
        try {
            multicastResult = sender.send(message, regIdList, retryTimes);
        } catch (IOException e) {
            logger.error("Error posting messages", e);
            return;
        }