FCM does not support more than 500 tokens

[hakkiyagiz]

Hi,

We found an issue about fcm tokens count in a single payload. If we try to send more than 500 tokens in a single payload, nothing happens in gorush container and 'api/stat/app' does not count any success or failure stats under android field.

So we had to reduce tokens from 1000 to 500 in a single payload for proper functioning.

ver. : v1.18.7 Latest