**Mandatory.** Must be implemented by all devices. Note that the response form a level II device is different than from a level I device.

Response from node(s) looks like this from a level I device:

 | byte 0 | byte 1 | byte 2 | byte 3 | byte 4 | byte 5 | byte 6 | byte 7 | 
 | :------: | ------ | ------ | ------ | ------ | ------ | ------ | ------ | 
 | 0      | GUID15 | GUID14 | GUID13 | GUID12 | GUID11 | GUID10 | GUID9  | 
 | 1      | GUID8  | GUID7  | GUID6  | GUID5  | GUID4  | GUID3  | GUID2  | 
 | 2      | GUID1  | GUID0  | MDF0   | MDF1   | MDF2   | MDF3   | MDF4   | 
 | 3      | MDF5   | MDF6   | MDF7   | MD8    | MDF9   | MDF10  | MDF11  | 
 | 4      | MDF12  | MDF13  | MDF14  | MDF15  | MDF16  | MDF17  | MDF18  | 
 | 5      | MDF19  | MDF20  | MDF21  | MDF22  | MDF23  | MDF24  | MDF25  | 
 | 6      | MDF26  | MDF27  | MDF28  | MDF29  | MDF30  | MDF31  | 0      | 

All seven frames should be sent also if the MDF URL is shorter than 32 characters,

A level II device should respond with [CLASS2_PROTOCOL, TYPE=32](./class2.protocol.md#type20)
