Re: send 2 key/values with ZMQ PUB sink

[Jeff Long]

No, the current code will only add the key (topic) to each message.

Tags are passed through ZMQ, so you could inject tags (this might require a custom block) periodically and receive them in JAERO. You probably don't want them in every message anyway. This means that the receiver will need to wait until the next time the tags are sent, though. If you can work this out, it's cleaner.

On Tue, Jan 18, 2022 at 4:03 AM Paul Atreides <maud.dib1984@gmail.com> wrote:

i'm passing downstream data to an external application (JAERO) which can decode audio data from a ZMQ socket.

JAERO's ZMQ SUB receives demod data as 3 separate messages:

-TOPIC

-SAMP RATE

-DATA

I'm using GNURadio 3.9 so I can pass the TOPIC no problem, but passing the sample rate as a separate message right after the topic has proven to be a challenge.

Currently, i've written a ZMQ PUB Sink in a Python embedded block that sends the zmq messages in the 3 message format above, it's a bit hacky but It's working. I'm looking for a better way to do this that uses the in-built GNURadio mechanisms to emit a custom key/value on the same interval as the topic and data.

Is there a way to send a second key/value pair with each TOPIC and DATA message that's sent?

For reference, this is the downstream ZMQ interface

https://github.com/jontio/JAERO/blob/3d92aea9362e0565bc6bc5300391a8bbbecf93ed/JAERO/zmq_audioreceiver.cpp#L37-L88