mosquitto_sub: how to find out to which topic a messages belong to

[Grossmann200]

Hi,
I am using several mqtt-topics to control my home-network.
In order to get an overview of all messages which have been send, I can use the #-wildcard: mosquitto_sub -h <IP> -p <port> "home/#".
But the output will be the messages only, without the full topic behind it.

E.g. I have two lamps, each controlled by it's own topic:
Lamp living-room: /home/lamp/living-room
Lamp kitchen: /home/lamp/kitchen

If the lamps are now turned on/off, mosquitto_sub -h <IP> -p <port> "home/lamp/#" will only tell me
on
on
off
... and I will not see, which lamp was turned on/off

[Frank Pagliughi]

Use the "-v" switch for mosquitto sub. It will print the topic on which the message arrived and then the payload - separated by a space, I believe.
You will see something like:

$ mosquitto_sub -v -t "home/#"
home/lamp/livingroom on
home/lamp/kitchen on
home/lamp/livingroom off

From the mosquitto_sub man page:

       -v, --verbose
           Print received messages verbosely. With this argument, messages will be printed as "topic
           payload". When this argument is not given, the messages are printed as "payload".

Frank

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[Grossmann200]

Frank, thanks a lot! That is exactly what I was looking for.
(... I am so stupid, indeed I also checked the manpages ... but somehow overlooked verbose)

:-)