code: final void setSubtype(Byte value) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "setSubtype", value);
          jmo.setField(JsHdrAccess.SUBTYPE, value);
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "setSubtype");
      }
docs: Set the Byte field which indicates the subtype of the message.
  
  @param value The Byte value of the Message SubType field