MODBUS TCP help

mehmet karakaya Guest #5539170
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hello dear forum,

I am trying to MODBUS TCP comunicate STM32 with Mach3

I have read the TCP documents in internet and learned
that first of all Mach3 send a TCP SYN message to the STM32

this time I send a SYN-ACK message to Mach3

after this Mach3 must send a ACK message to STM32

as you can see in the attached picture

the SYN from Mach3 and SYN-ACK from STM32 is there
(192.168.1.2) PC (192.168.1.110) STM32

however ACK from Mach3 is missing and Mach3 reports "conection timeout"

there is a warning from Wireshark yellow coloured

what does this warning say ? what shall I do next ?

thank you
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mehmet karakaya Guest #5549665
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hello dear forum,

I finally managed to respond to Mach3 MODBUS TCP SYN message

I have sent a correct SYN ACK message back to Mach3

but this time Mach3 responds with RST message - see picture

what shall I send back to Mach3 in order to finish connection process

thank you
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