do apple restrict the number of push notifications over a period of time in DEV?

Hi Team,

We are trying to connect with our .pem file to apple, for testing pushnotification and here our UseCase

Send - Connection
Send -> Block
a few minutes later
Send -> Connection
Send -> Block

where Block = connection refused, so it failed to even "connect" to apple

We also notice that the DNS resolved to many different IP addresses. Some work, some block

some IP addresses send us reset packets which means we get connection refused and some complete the TCP handshake and work.

When is the old SSL push notification supported up to before we have to swap to HTTP2?

we are trying to work out IF this is still supported?

any help would be appreciated

Thanks in advance.