Just a thought, what protocol are you using? If it’s the standard pdl-tcip with mlp_tcp_.pdl, then maybe the vendor is not using the hex 0B1C0D “envelope” to encapsulate the ACK (though it seems like you’d see something then with the EO turned up).
Just a stab in the dark here: the vendor may be telling you that they are sending back a low level TCP protocol packet ACK. What they need to do is send back an application level ACK (lower level HL7 hybrid wrapped). Even a phrase would do here: however, you would have to crank up some TCL logic to handle that reply (and a companion resend if you are configured to do auto-resend as Cloverleaf will not allow you to manage the State 16 from a Reply procedure if auto-resend is checked).
Alternatively, if you have network resources in your shop, a sniffer could be placed on this interface to see exactly what is coming back if anything at all.
Hope this helps you out.
Good hunting!
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