Release assistance indication %RAI with MQTT protocol

RE: Release assistance indication %RAI with MQTT protocol

Albrecht Markus Schellenberger — Mon, 08 Nov 2021 14:23:18 GMT

Refering to case #279015

Regards,

Markus

RE: Release assistance indication %RAI with MQTT protocol

con2021 — Tue, 02 Nov 2021 12:27:01 GMT

[quote userid="100109" url="~/f/nordic-q-a/77530/release-assistance-indication-rai-with-mqtt-protocol/320367#320367"]RAI should indicate early release after receiving one package, though[/quote]

How do we know that the ack of the TCP is received, so that we can set the RAI?

RE: Release assistance indication %RAI with MQTT protocol

Albrecht Markus Schellenberger — Fri, 16 Jul 2021 07:53:15 GMT

Hello Leo,

[quote user=""]

1. Is using RAI feasible in MQTT protocol(because nrfcloud api use MQTT protocol)?

[/quote]

Yes, RAI is possible to use with MQTT. But since MQTT is based on TCP (which means at least two packages, one UL TCP data followed by DL TCP ACK), RAI should indicate early release after receiving one package, though.

[quote user=""]2. How can I tell the modem that last data packet is sent? [/quote]

The modem will take care of this automatically. The only thing the application has to do here, is to switch to the right socket option. The Serial LTE modem application demonstrates how this can be done.

This pull request shows the available socket options.

I hope this answers your questions!

Regards,

Markus