Constant IM_REVISION 

pub const IM_REVISION: u8 = 13; // 13u8

interactionModelRevision value emitted on every outgoing IM message rs-matter sends — both responder-side (ReportData / WriteResponse / InvokeResponse / StatusResponse / SubscribeResponse, in crate::dm and [status] / [attr::subscribe]) and requestor-side (the client builders in crate::im::client and TimedReq).

The TLV context tag it is emitted under is IM_REVISION_TAG (= 0xFF).

13 has been the spec-mandated value since Matter 1.3; see the “Revision History” of the Matter Core Specification.