WICED Studio Wi-Fi Combo

[Anonymous]

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?

[AxLi_1746341 · Accepted solution]

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

[Anonymous]

but what topic is exactly ?

[Anonymous]

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.