multiple messages in mqtt consumer

VamsiKrishnaYenumala

Hi everyone we are trying to consume the device messages from flespi through MQTT, and here we are facing an issue with the data incoming at our end. where we are getting same message multiple time due to qos handled is 0
is there any way we can change this qos to 2 from broker side.
Note: we are connecting to flespi MQTT broker to consume the messages.

lese

VamsiKrishnaYenumala You should be able to modify the QoS setting on your MQTT client side. In fact I think that's how it works according to MQTT specs - client sets it for the initiated sessions, not broker. QoS 2 is usually an overkill. QoS 1 typically works just fine to ensure delivery without duplicating messages. I suggest you test with QoS set to 1.

shal

VamsiKrishnaYenumala take a look at your topic subscriptions. Message initially is published for a channel topic and afterwards it is published to the device topic. If you are subscribing to wide topic like 'flespi/message/#' you will end up with almost same message delivered twice to your client. See here the message registration and delivery pipeline: https://flespi.com/blog/how-to-access-messages-in-flespi-http-mqtt-and-more