cancel
Showing results for 
Search instead for 
Did you mean: 

WICED Studio Wi-Fi Combo

Anonymous
Not applicable

in mqtt what is exactly topic  and why we use "#" and "+" in topic,i have read somewhere that topic is like massage Que but am not getting how?

0 Likes
Reply
1 Solution
Honored Contributor

ineev_teksun wrote:

in mqtt what is exactly topic  and why we use "#" and "+" in topic,i have read somewhere that topic is like massage Que but am not getting how?

"#" and "+" are defined in MQTT protocol as "multi-level wildcard" and "single level wildcard":

MQTT Version 3.1.1

View solution in original post

3 Replies
Honored Contributor

ineev_teksun wrote:

in mqtt what is exactly topic  and why we use "#" and "+" in topic,i have read somewhere that topic is like massage Que but am not getting how?

"#" and "+" are defined in MQTT protocol as "multi-level wildcard" and "single level wildcard":

MQTT Version 3.1.1

View solution in original post

Anonymous
Not applicable

but what topic is exactly ?

0 Likes
Reply
Anonymous
Not applicable

You can think of topic as a channel.

Typically the server would support many topics (channels), and a client can publish/subscribe to a few topics (channels) of interest.