Android Question MQTT multiple chat

[postasat]

Hi,
is it possible to use in the same wifi network two or more chat (with autodiscovery function) completely separated ?

Chat1 ---> Server1 Clientx Clienty Clientz
Chat2 ---> Server2 Clienta Clientb Clientc
Chat1 ---> Server3 Client1 Client2 Client3

Thank you.

 

[coslad]

Sure , you can do that !!!

 

[postasat]

Hi,
how can I be sure that clientx clienty clientz connect and exchange message only with server1 and clienta, clientb, clientc exchange message only with server2 and so for other chat ?
Autodiscovery connect automatically the client with ?

Thank you.

 

[coslad]

You have to set 3 different topic and subscrive each device only to the right topic .

example :

topic 'Chat1' have to subscrive those devices : Server1 Clientx Clienty Clientz

 

[postasat]

Hi,
I'm a newbie and it's not clear for me how to modify Mqtt Chat code to set 3 different topic to use in the same wifi network two or more chat (with autodiscovery function) completely separated.

What code exactly I must modify in the Erel "MqttChatwithautodiscovery" example ?
https://www.b4x.com/android/forum/threads/mqtt-chat-with-auto-discovery.75713/

Thank you.

 

[postasat]

Hi,
when a client try a connection to a specific server and in the same net there are two or more server, changing topic is enough to choose which server to connect to ?
The clients will connect to all server in the net or only with the last discovered server recorded when launching connect ?
How can I choose which server to connect ?

Thank you.

 

[Erel]

There is no server role in MQTT.

Only clients and a broker. Many clients can connect to the same broker.
You can also have multiple brokers though it is usually not needed.

Use different topics to manage different groups of clients.