buf.writeByte(0x04); // Erect Domain Request
// Client SHOULD initialize both the subHeight and subinterval fields of the MCS Erect Domain Request PDU to zero.
buf.writeByte(1); // ErectDomainRequest::subHeight length = 1 byte
buf.writeByte(0); // ErectDomainRequest::subHeight
buf.writeByte(1); // ErectDomainRequest::subInterval length = 1 byte
buf.writeByte(0); // ErectDomainRequest::subInterval