The specification sorts these into groups by number range, and the ranges matter. A device can send profile messages to a channel, a group, or a function block, but property exchange messages always go to a function block.
Profile Configuration
| Value |
Number |
Description |
ProfileInquiry |
0x20 |
Asks what profiles exist at an address |
ProfileInquiryReply |
0x21 |
Answers with a list of the profiles that are on and a list of the ones that are off |
SetProfileOn |
0x22 |
Asks a device to turn on a profile, and says how many channels to give it |
SetProfileOff |
0x23 |
Asks a device to turn off a profile |
ProfileEnabledReport |
0x24 |
Sent to everyone when a profile is turned on, for any reason |
ProfileDisabledReport |
0x25 |
Sent to everyone when a profile is turned off, for any reason |
ProfileAddedReport |
0x26 |
Sent to everyone when a device gains a profile it didn’t have before |
ProfileRemovedReport |
0x27 |
Sent to everyone when a device loses a profile |
ProfileDetailsInquiry |
0x28 |
Asks about one part of how a device supports a profile |
ProfileDetailsInquiryReply |
0x29 |
Answers a details inquiry |
ProfileSpecificData |
0x2F |
Carries whatever a profile’s specification says it carries |
Property Exchange
| Value |
Number |
Description |
PropertyExchangeCapabilitiesInquiry |
0x30 |
Asks how many requests the device will take at once |
PropertyExchangeCapabilitiesInquiryReply |
0x31 |
Answers with that number |
PropertyGetDataInquiry |
0x34 |
Asks for a resource |
PropertyGetDataInquiryReply |
0x35 |
Answers with the resource, in as many pieces as it takes |
PropertySetDataInquiry |
0x36 |
Sends a resource to the device |
PropertySetDataInquiryReply |
0x37 |
Answers a set request |
PropertySubscriptionInquiry |
0x38 |
Starts, updates, or ends a subscription to a resource |
PropertySubscriptionInquiryReply |
0x39 |
Answers a subscription message |
PropertyNotify |
0x3F |
Tells the other side something about a request that’s in progress |
Process Inquiry
| Value |
Number |
Description |
ProcessInquiryCapabilities |
0x40 |
Asks what process inquiry features a device has |
ProcessInquiryCapabilitiesReply |
0x41 |
Answers with a set of flags, one for each feature |
MidiMessageReport |
0x42 |
Asks a device to report its current state as MIDI messages |
MidiMessageReportReply |
0x43 |
Says which of the requested messages will be reported |
MidiMessageReportEnd |
0x44 |
Marks the end of a message report |
Management
| Value |
Number |
Description |
Discovery |
0x70 |
Announces the sender and asks what’s out there |
DiscoveryReply |
0x71 |
Answers Discovery with the device’s identity and the categories it supports |
EndpointInquiry |
0x72 |
Asks for information about an endpoint |
EndpointInquiryReply |
0x73 |
Answers an endpoint inquiry |
Ack |
0x7D |
Acknowledges a message, usually to say a request is making progress |
InvalidateMuid |
0x7E |
Withdraws an identifier. It’s sent to everyone and gets no reply |
Nak |
0x7F |
Says a request failed, with a status code and text that explains why |
