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performance - How do I include STX (Start of Text) and ETX (End of Text) characters as prefixes and suffixes to TCP Sampler in J

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I'm sending a text to server which a Socket message connected via a Port and IPI've used JSR

I'm sending a text to server which a Socket message connected via a Port and IP I've used JSR223sampler to check the connection, which says "Connected"

This is my Text message PLPL|WM|SL|AS|PICK|100002001|PICKORDER|I|GPick059|2025-04-30 22:05:09.00||E|N|Y||MX1| GPick059|T123456001|1|JProd02|1

I've tried using the Escape Sequence \x02 for STX character. \x03 represents the ETX character. However the message I see on the server logs is with the Escape Characters and not STX and ETX.

I've used TCPClientImpl and BinaryTCPClientImpl TCPClient Classes

Message in the Server Logs:

07:37:34.097 [8] (null) INFO Interface.SocketProcessing.SocketProcessBase - Client IP:63862 Message : \x02PLPL|WM|SL|AS|PICK|100002001|PICKORDER|I|GPick059|2025-04-30 22:05:09.00||E|N|Y||MX1| GPick059|T123456001|1|JProd02|1 \x03

I'm sending a text to server which a Socket message connected via a Port and IP I've used JSR223sampler to check the connection, which says "Connected"

This is my Text message PLPL|WM|SL|AS|PICK|100002001|PICKORDER|I|GPick059|2025-04-30 22:05:09.00||E|N|Y||MX1| GPick059|T123456001|1|JProd02|1

I've tried using the Escape Sequence \x02 for STX character. \x03 represents the ETX character. However the message I see on the server logs is with the Escape Characters and not STX and ETX.

I've used TCPClientImpl and BinaryTCPClientImpl TCPClient Classes

Message in the Server Logs:

07:37:34.097 [8] (null) INFO Interface.SocketProcessing.SocketProcessBase - Client IP:63862 Message : \x02PLPL|WM|SL|AS|PICK|100002001|PICKORDER|I|GPick059|2025-04-30 22:05:09.00||E|N|Y||MX1| GPick059|T123456001|1|JProd02|1 \x03

  • performance
  • tcp
  • jmeter
Share Improve this question edited Mar 28 at 11:50 g90uagk asked Mar 28 at 11:42 g90uagkg90uagk 4192 gold badges6 silver badges16 bronze badges
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1 Answer 1

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You can use __groovy() function like:

${__groovy(URLDecoder.decode('%02'\, 'ASCII'),)}

and

${__groovy(URLDecoder.decode('%03'\, 'ASCII'),)}

More information: How to Send Control Characters Using the JMeter TCP Sampler?

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