Doris-Ge

Hi @filippotp, Thanks for reporting the issue! According to the answers in https://stackoverflow.com/questions/53765366/urllib3-connectionpool-connection-pool-is-full-discarding-connection, seeing `WARNING:urllib3.connectionpool:Connection pool is full, discarding connection: fcm.googleapis.com. Connection pool size: 10` does not mean that there...

> Thank you for flagging the issue with the `Obsolete` tag! @Doris-Ge could you take a look at the [ObsoleteAttribute](https://learn.microsoft.com/en-us/dotnet/api/system.obsoleteattribute?view=net-7.0) when you get a chance, please? Thanks! Sure. I think...

> Is this related to the legacy Firebase Cloud Messaging (FCM) APIs which will be discontinued on June 20, 2024? Does SendMulticastAsync use Batch send API? Yes and yes.

Hi @KrishnakanthYachareni, Sorry for the late response! 1. `sendEach` method uses FCM V1 send API, whereas `sendAll` uses FCM Batch send API which is going to be decommissioned soon in...

Hi @mgeisler, I'm Doris. I'd like to help! How should I coordinate with other volunteers?

@superwhd, feel free to reopen the conversations that I marked as resolved if you have more comments. Thanks!

Hi [maharavindran](https://github.com/maharavindran), Could you provide a full stack trace for failure cases mentioned above? Additionally, please try sending a smaller batch of device tokens, perhaps 100 per request.

Thanks @maharavindran! I'm glad to hear that increasing timeouts helped reduce the failures! Sending to a large batch of device tokens can be slow because `sendEachForMultiCast` sends an HTTP request...