QtSerialPort, readyRead emitted multiple times

Gaetano03

Hello,

I have been reading people dealing with this issue, but still trying to get my head around it.

I am running the Qt example for reader async (no more than that, except for that I am not stopping it once the read is done as this is what I want in my final app). Despite I expect one message to be read from serial port, I get the same message printed out multiple times.

How can you deal with the problem of emitting readyread more than once?

THanks in advance for your help

Christian Ehrlicher

Are you sure the sender doesn't send data continuously?

Gaetano03

I am using Hercules to double check, and on it I am just receiving a single message as I would expect

VRonin

Have a look at void ChatClient::onReadyRead() of this wiki page. It uses QTcpSocket but the explanation is valid for QSerialPort too

Kent-Dorfman

readyread can trigger on any number of received characters, including (especially) an incomplete message. you are reading a stream. Just because you send a discrete message doesnt mean its received and parsed as a discrete message.