L2capTest: Add Send Reject Test am: c69c11ef

        assertThat(cert_channel).emits(

            L2capMatchers.IFrame(tx_seq=3, payload=b'abc', f=Final.NOT_SET))

    @metadata(

        pts_test_id="L2CAP/ERM/BV-16-C", pts_test_name="Send S-Frame [REJ]")

    def test_send_s_frame_rej(self):

        """

        Verify the IUT can send an S-Frame [REJ] after receiving out of sequence

        I-Frames

        """

        self._setup_link_from_cert()

        tx_window_size = 4

        self.cert_l2cap.turn_on_ertm(

            tx_window_size=tx_window_size, max_transmit=2)

        (dut_channel, cert_channel) = self._open_channel(

            scid=0x41, psm=0x33, mode=RetransmissionFlowControlMode.ERTM)

        cert_channel.send_i_frame(

            tx_seq=0, req_seq=0, f=Final.NOT_SET, payload=SAMPLE_PACKET)

        cert_channel.send_i_frame(

            tx_seq=2, req_seq=0, f=Final.NOT_SET, payload=SAMPLE_PACKET)

        assertThat(cert_channel).emits(

            L2capMatchers.SFrame(

                req_seq=1,

                f=Final.NOT_SET,

                s=SupervisoryFunction.REJECT,

                p=Poll.NOT_SET))

        for i in range(1, tx_window_size):

            cert_channel.send_i_frame(

                tx_seq=i, req_seq=0, f=Final.NOT_SET, payload=SAMPLE_PACKET)

        assertThat(cert_channel).emits(

            L2capMatchers.SFrame(

                req_seq=tx_window_size,

                f=Final.NOT_SET,

                s=SupervisoryFunction.RECEIVER_READY,

                p=Poll.NOT_SET))

    @metadata(

        pts_test_id="L2CAP/ERM/BV-18-C",

        pts_test_name="Receive S-Frame [RR] Final Bit = 1")