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 ?