Ik maak gebruik van een Particle Boron om verbinding te maken via LTE-M. In de documentatie staat het volgende over het open houden van de UDP verbinding :
A keep-alive is used to implement "UDP hole punching" which helps maintain the connection from the cloud to the device. A temporary port-forwarded back-channel is set up by the network to allow packets to be sent from the cloud to the device. As this is a finite resource, unused back-channels are periodically deleted by the network.
Should a device becomes unreachable from the cloud (such as a timed out function call or variable get), one possible cause of this is that the keep alives have not been sent often enough.
The keep-alive for cellular devices duration varies by mobile network operator. The default keep-alive is set to 23 minutes, which is sufficient to maintain the connection on Particle SIM cards. 3rd party SIM cards will need to determine the appropriate keep alive value, typically ranging from 30 seconds to several minutes.
Ik wil graag weten wat de keep alive tijd is die ik moet hanteren via Item.internet.m2m voor mijn LTE-M simkaart.