REQUESTS_BLOCKED — MoQT draft-13 §8.6.

The REQUESTS_BLOCKED message is sent when an endpoint would like to send a new request, but cannot because the Request ID would exceed the Maximum Request ID value sent by the peer. The endpoint SHOULD send only one REQUESTS_BLOCKED for a given Maximum Request ID.

An endpoint MAY send a MAX_REQUEST_ID upon receipt of REQUESTS_BLOCKED, but it MUST NOT rely on REQUESTS_BLOCKED to trigger sending a MAX_REQUEST_ID, because sending REQUESTS_BLOCKED is not required.

REQUESTS_BLOCKED Message {
  Type (i) = 0x1A,
  Length (16),
  Maximum Request ID (i),
}

Figure 8: MOQT REQUESTS_BLOCKED Message

Maximum Request ID: The Maximum Request ID for the session on which the endpoint is blocked. More on Request ID in Section 8.7.