Mulitple publishers to same topic

[Guru Alex]

Hello,

We have configured two publishers that publish messages to the same topic. While the messages get through to the subscribers, I see the following error message in the application logs:

ERROR 1 --- [: msg-manager] o.s.i.m.outbound.MqttPahoMessageHandler : Lost connection; will attempt reconnect on next request

The EMQX logs has the following:

[error] <<"Pub1">>@172.21.19.100:55027 [Channel] Unexpected sock_closed: einval

The reconnection keeps happening in a loop. So can someone please help with the following questions:

1. Is it possible to have multiple publishers publish to the same topic ?

2. If yes, is there any configuration change needed ?

Regards,

Guru

[imsbha...@gmail.com]

Hi Guru,

The two publishers, publishing on the same topic should have different clientIds. 

Can you check the Client Identifier (ClientId) you are using in the MQTT CONNECT ?

Thanks,

Saurabh

[Guru Alagwadi]

Hi Saurabh,

Yes, that was the issue. The developer (java) had left the ClientID field blank assuming that it will generate a unique string as ClientID. For some reason, it did not. Now we set the ClientID to some unique strings and the error disappeared.

Thanks a lot for the help

Regards,

Guru