In Z-Wave, some examples of multichannel devices are
In order to communicate with these devices with multiple endpoints, multichannel encapsulation is used.
Note, when adding devices of this type in the PC controller, it is necessary to hit the "Node Info" button to see all the endpoints.
Typically, the root device is mapped to endpoint 1 to allow some functionality with controllers that do not support multichannel encapsulation.
When Z/IP gateway communicates with multichannel devices the source or destination end point fields are non-zero in the COMMAND_ZIP_PACKET command.
In depth information about multichannel communication can be found in: https://www.silabs.com/documents/login/application-notes/APL12955-Z-Wave-Multi-Channel-Basics.pdf