Firebase iOS push notification receiving but sometimes not?

Question

I have implemented push notification in my iOS App using Firebase SDK and I am successfully getting push notifications from Firebase console as well as from server.

But on many occasions, I wait and wait, and even send 5-6 notifications from Firebase console but not received on App. I tried to change network (both Mobile data & WiFi) but still not receiving. After waiting for an hour and more, suddenly it starts working (I am not re-installing App).

What may be the reason? If network is an issue, then why is it not woking though I change my network to WiFi having good bandwidth?

Bushido

I have EXACTLY this issue. Did you get anywhere with it? – Lampblack

Be sure sequence of code is proper.. for example, first you need to set delegate for push notification, then configure Firebase. I will send you soon – Bushido

Wow, thanks so much. I will really appreciate this help. – Lampblack

I will add code snippet as an answer which may help you.. – Bushido

Can you tell me your exact issue? Are you not getting push notification sometimes? Or never getting? – Bushido

Sometimes. I'll try everything, and they don't come. I try in a few hours, and everything works fine. – Lampblack

Let us continue this discussion in chat. – Bushido

Do you have any code to help me? – Lampblack