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BlackBerry had a working push system without hanging TCP connections. You made an HTTP call to BlackBerry, who then sent a UDP packet over the network direct to
by amaccuish 3y ago
BlackBerry had a working push system without hanging TCP connections. You made an HTTP call to BlackBerry, who then sent a UDP packet over the network direct to the device. It's a shame we've lost this architecture.
- Karrot_Kream 3y agoHuh interesting. How did the remote know the endpoint to send the UDP packet to? I would expect NAT and firewalls would make it hard to route inbound UDP? Did they do some sort of STUN style negotiation through HTTP?
- amaccuish 3y agoBlackBerry operated it's own GPRS APN, so all Blackberries registered directly with it from the tower, and so it always had their up-to-date location on the network.