Android Question How clear Retain message in mqtt?

[darabon]

Hi,
According to the below link,

How to clear ALL retained mqtt messages from Mosquitto?

I've seen the mosquitto_pub -h [server] -r -n -t [XYZ] syntax for clearing out one off messages. My problem is the device developers have posted a lot of garbage messages. I have a Java/Paho code...

stackoverflow.com

We have to send the null byte to relate the topic to clear retain message
But in B4a, when I send empty message to clear it, does not happening
Please help me

 

[DonManfred]

But in B4a, when I send empty message to clear it, does not happening

Empty message = NOT null byte

Try send a null byte

 

[darabon]

Empty message = NOT null byte

Try send a null byte

I tried but that is a message and does not clear retain message

 

[darabon]

Empty message = NOT null byte

Try send a null byte

You're right, I test with MqttBox and when I receive the empty packet, I thought not working
Thanks