MQTT-SN Old data hangs in the buffer

[kenval]

My problem is with examples of publishing and subscribing at the same time. I crossed them by adding a check for subscription if I did not sign I do this and register the topic id

1. When I try to send a message from the MQTT client to the sensor, the data comes fine

<info> app: data: {"value": true}

2. Next, I publish data already from the sensor itself

{
"idx" : 157,
"nvalue" : 1,
"svalue" : ""
}

In the next step, I repeat step 1, sending data from MQTT and receive a clogged buffer with the previous message

<info> app: data: {
  "state": true
}value" : 1,
"svalue" : ""
}

How can you defeat this? I think you need to clear the buffer somehow after sending the message by

mqttsn_client_publish( & m_client, m_topic_pub.topic_id, (const uint8_t *)Func(), strlen(Func()), & m_msg_id);

[Albrecht Markus Schellenberger]

Hello,

I recommend you do one of the following things:

1. Only print as much characters as you have received with the message. The data length of the frame is available at receiving time.
2. Separate your messages in the buffer using a null-terminated string '\0'. A print-function will only print characters until the first null terminator.

Cheers!

Markus