Get_Instance_Attribute_List

[ZootHii]

How can I use this service ?

[kasemir]

Good question.

Get_Instance_Attribute_List has been added to the list of service IDs
by e88e1c4 without actually using it,

etherip/src/main/java/etherip/types/CNService.java

Line 31 in 88118cf

Get_Instance_Attribute_List(0x55), // Logix5000 Data Access

You can see how the related Get_Attribute_Single is used to read a single attribute in for example

etherip/src/main/java/etherip/EtherNetIP.java

Line 195 in 88118cf

public int getIntAttribute(final CNClassPath classPath ,final int instance, final int attr) throws Exception

In the original C version of this code, you can see how Get_Attribute_Single is called several times after connecting to the PLC to read various informational items like the vendor ID, serial number etc.:
https://github.com/EPICSTools/ether_ip/blob/06f520c55cc1e58ef1782f724498e0c4146f3d6d/ether_ipApp/src/ether_ip.c#L2536

If you have the protocol documentation for Get_Instance_Attribute_List, you could try to add similar code to encode & decode the traffic for Get_Instance_Attribute_List.