I am trying to use mobile web push notifications to enable chat on my site. Since I have a use case to remind users about any updates on the chat - I want to use push notification on the web.
I have experimented with web push notification using FCM and the delivery rate hovers around 60% for me. It is either not delivered (no delivered_time stamp) or gives a 400 error - "Invalid Token format"
I need to understand if there are any improvements I can make to increase the delivery rate? Can it be 100%? Also, does notifying on mobile web for chat seem to be a valid use case for push notifications or do you think there are better alternatives?
Dump of my log - https://docs.google.com/spreadsheets/d/1oiGkfgiRtoDZTT6bSu9UduHj6IQljj5bFDbliDvbI8I/edit?usp=sharing
Unlike GCM(now FCM) notifications, web notifications need the browser to be open(at least in the background) for them to be delivered. And There are still a lot of anolmalies in the system since it is still marked as an experimental technology. Even though the delivery rate can't be 100%, it becomes more and more stable with every release and the future is bright for web-push-notifications. We experience a delivery rate of 60-70% on tracking impressions of the campaigns for 36 hours.