444 lines
12 KiB
Plaintext
444 lines
12 KiB
Plaintext
/* LAPDm definitions according to 3GPP TS 44.006
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* (C) 2017-2018 by Harald Welte <laforge@gnumonks.org>
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* All rights reserved.
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*
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* Released under the terms of GNU General Public License, Version 2 or
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* (at your option) any later version.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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module LAPDm_Types {
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import from General_Types all;
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import from Osmocom_Types all;
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type uint3_t LapdmSapi;
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type BIT2 LapdmSBits;
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type BIT3 LapdmUBits;
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type BIT2 LapdmU2Bits;
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/* 44.006 6.3.2 */
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const boolean cr_MO_CMD := false;
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const boolean cr_MO_RSP := true;
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const boolean cr_MT_CMD := true;
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const boolean cr_MT_RSP := false;
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/* TS 44.006 Figure 4 */
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type record LapdmAddressField {
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BIT1 spare,
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uint2_t lpd,
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LapdmSapi sapi,
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boolean c_r,
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boolean ea
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} with { variant "FIELDORDER(msb)" };
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template LapdmAddressField tr_LapdmAddr(template LapdmSapi sapi, template boolean c_r) := {
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spare := '0'B,
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lpd := 0,
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sapi := sapi,
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c_r := c_r,
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ea := true
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};
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template (value) LapdmAddressField ts_LapdmAddr(LapdmSapi sapi, boolean c_r) := {
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spare := '0'B,
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lpd := 0,
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sapi := sapi,
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c_r := c_r,
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ea := true
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};
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type record LapdmCtrlI {
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uint3_t n_r,
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boolean p,
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uint3_t n_s,
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BIT1 spare ('0'B)
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} with { variant "FIELDORDER(msb)" };
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type record LapdmCtrlS {
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uint3_t n_r,
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boolean p_f,
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LapdmSBits s,
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BIT2 spare ('01'B)
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} with { variant "FIELDORDER(msb)" };
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type record LapdmCtrlU {
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LapdmUBits u,
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boolean p_f,
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LapdmU2Bits u2,
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BIT2 spare ('11'B)
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} with { variant "FIELDORDER(msb)" };
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/* TS 44.006 Table 3 */
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type union LapdmCtrl {
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LapdmCtrlS s,
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LapdmCtrlU u,
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LapdmCtrlI i,
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uint8_t other
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} with { variant "TAG(u, spare = '11'B;
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s, spare = '01'B;
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i, spare = '0'B;
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other, OTHERWISE)" };
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/* )" }; */
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/* TS 44.006 Table 4 */
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template LapdmCtrl tr_LapdmCtrlS := {
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s := { n_r := ?, p_f := ?, s := ?, spare := '01'B }
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};
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template LapdmCtrl tr_LapdmCtrlU := {
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u := { u := ?, p_f := ?, u2 := ?, spare := '11'B }
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};
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/* TS 44.006 Table 4 */
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template LapdmCtrl tr_LapdmCtrlI(template uint3_t nr, template uint3_t ns, template boolean p) := {
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i := { n_r := nr, p := p, n_s := ns, spare := '0'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlI(uint3_t nr, uint3_t ns, boolean p) := {
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i := { n_r := nr, p := p, n_s := ns, spare := '0'B }
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};
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template LapdmCtrl tr_LapdmCtrlRR(template uint3_t nr, template boolean pf) modifies tr_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '00'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlRR(uint3_t nr, boolean pf) := {
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s := { n_r := nr, p_f := pf, s := '00'B, spare := '01'B }
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};
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template LapdmCtrl tr_LapdmCtrlRNR(template uint3_t nr, template boolean pf) modifies tr_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '01'B }
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};
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template LapdmCtrl tr_LapdmCtrlREJ(template uint3_t nr, template boolean pf) modifies tr_LapdmCtrlS := {
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s := { n_r := nr, p_f := pf, s := '10'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlREJ(uint3_t nr, boolean pf) := {
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s := { n_r := nr, p_f := pf, s := '10'B, spare := '01'B }
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};
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template LapdmCtrl tr_LapdmCtrlSABM(template boolean p) := {
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u := { u := '001'B, p_f := p, u2 := '11'B, spare := '11'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlSABM(boolean p) := {
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u := { u := '001'B, p_f := p, u2 := '11'B, spare := '11'B }
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};
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template LapdmCtrl tr_LapdmCtrlDM(template boolean f) := {
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u := { u := '000'B, p_f := f, u2 := '11'B, spare := '11'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlDM(boolean f) := {
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u := { u := '000'B, p_f := f, u2 := '11'B, spare := '11'B }
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};
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template LapdmCtrl tr_LapdmCtrlUI(template boolean p := false) := {
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u := { u := '000'B, p_f := p, u2 := '00'B, spare := '11'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlUI(boolean p := false) := {
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u := { u := '000'B, p_f := p, u2 := '00'B, spare := '11'B }
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};
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template LapdmCtrl tr_LapdmCtrlDISC(template boolean p) := {
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u := { u := '010'B, p_f := p, u2 := '00'B, spare := '11'B }
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};
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template LapdmCtrl ts_LapdmCtrlDISC(boolean p) := {
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u := { u := '010'B, p_f := p, u2 := '00'B, spare := '11'B }
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};
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template LapdmCtrl tr_LapdmCtrlUA(template boolean f) modifies tr_LapdmCtrlU := {
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u := { u := '011'B, p_f := f, u2 := '00'B, spare := '11'B }
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};
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template (value) LapdmCtrl ts_LapdmCtrlUA(boolean f) := {
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u := { u := '011'B, p_f := f, u2 := '00'B, spare := '11'B }
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};
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external function dec_LapdmAddressField(in octetstring stream) return LapdmAddressField
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with { extension "prototype(convert) decode(RAW)" };
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external function dec_LapdmCtrl(in octetstring stream) return LapdmCtrl
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with { extension "prototype(convert) decode(RAW)" };
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external function dec_LapdmCtrlU(in octetstring stream) return LapdmCtrlU
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with { extension "prototype(convert) decode(RAW)" };
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/* Formats B, Bter and B4 are used on DCCHs for frames containing an information field:
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/* - format Bter is used on request of higher layers if and only if short L2 header type 1 is
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* supported and a UI command is to be transmitted on SAPI 0 */
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/* - format B4 is used for UI frames transmitted by the network on SACCH; */
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/* - format B is applied in all other cases. */
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/* Format Bbis is used only on BCCH, PCH, NCH, and AGCH.
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/* Format B */
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type record LapdmFrameAB {
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LapdmAddressField addr,
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LapdmCtrl ctrl,
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uint6_t len,
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boolean m,
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uint1_t el,
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octetstring payload, /* zero-length in Frame A */
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octetstring padding
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} with { variant (len) "LENGTHTO(payload)"
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variant "FIELDORDER(msb)" };
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external function enc_LapdmFrameAB(in LapdmFrameAB si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameAB(in octetstring stream) return LapdmFrameAB
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with { extension "prototype(convert) decode(RAW)" };
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/* Format B4 */
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type record LapdmFrameB4 {
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LapdmAddressField addr,
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LapdmCtrl ctrl,
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octetstring payload
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} with { variant "" };
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external function enc_LapdmFrameB4(in LapdmFrameB4 si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameB4(in octetstring stream) return LapdmFrameB4
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with { extension "prototype(convert) decode(RAW)" };
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type record LapdmFrameBbis {
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octetstring payload
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} with { variant "" };
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external function enc_LapdmFrameBbis(in LapdmFrameBbis si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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external function dec_LapdmFrameBbis(in octetstring stream) return LapdmFrameBbis
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with { extension "prototype(convert) decode(RAW)" };
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type union LapdmFrame {
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LapdmFrameAB ab,
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LapdmFrameBbis bbis,
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LapdmFrameB4 b4
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} with { variant "" };
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external function enc_LapdmFrame(in LapdmFrame si) return octetstring
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with { extension "prototype(convert) encode(RAW)" };
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/* automatic decoding to the generic LapdmFrame will not work, you have to call one of the
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* type-specific decoder routines above */
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/* SABM frame with L3 payload */
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template (value) LapdmFrame ts_LAPDm_SABM(LapdmSapi sapi, boolean c_r, boolean p,
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octetstring l3) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlSABM(p),
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len := 0, /* overwritten in encoder */
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m := false,
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el := 1,
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payload := l3,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_SABM(template LapdmSapi sapi, template boolean c_r,
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template boolean p, template octetstring l3) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlSABM(p),
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len := ?,
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m := false,
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el := 1,
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payload := l3,
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padding := ?
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}
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}
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template (value) LapdmFrame ts_LAPDm_UA(LapdmSapi sapi, boolean c_r, boolean f,
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octetstring l3) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlUA(f),
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len := 0, /* overwritten in encoder */
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m := false,
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el := 1,
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payload := l3,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_UA(template LapdmSapi sapi, template boolean c_r,
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template boolean f, template octetstring l3) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlUA(f),
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len := ?,
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m := false,
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el := 1,
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payload := l3,
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padding := ?
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}
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}
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template (value) LapdmFrame ts_LAPDm_DM(LapdmSapi sapi, boolean c_r, boolean f) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlDM(f),
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len := 0, /* overwritten in encoder */
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m := false,
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el := 1,
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payload := ''O,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_DM(template LapdmSapi sapi, template boolean c_r,
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template boolean f) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlDM(f),
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len := ?,
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m := false,
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el := 1,
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payload := ''O,
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padding := ?
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}
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}
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template LapdmFrame ts_LAPDm_DISC(LapdmSapi sapi, boolean c_r, boolean p) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlDISC(p),
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len := 0,
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m := false,
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el := 1,
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payload := ''O,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_DISC(template LapdmSapi sapi, template boolean c_r,
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template boolean p) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlDISC(p),
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len := ?,
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m := false,
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el := 1,
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payload := ''O,
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padding := ?
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}
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}
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template LapdmFrame ts_LAPDm_UI(LapdmSapi sapi, boolean c_r, octetstring l3) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlUI,
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len := 0,
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m := false,
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el := 1,
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payload := l3,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_UI(template LapdmSapi sapi, template boolean c_r,
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template octetstring l3) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlUI,
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len := ?,
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m := false,
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el := 1,
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payload := l3,
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padding := ?
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}
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}
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template LapdmFrame ts_LAPDm_B4_UI(LapdmSapi sapi, boolean c_r, octetstring l3) := {
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b4 := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlUI,
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payload := l3
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}
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}
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template LapdmFrame tr_LAPDm_B4_UI(template LapdmSapi sapi, template boolean c_r,
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template octetstring l3) := {
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b4 := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlUI,
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payload := l3
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}
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}
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template LapdmFrame tr_LAPDm_I(template LapdmSapi sapi, template boolean c_r,
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template boolean p, template uint3_t nr,
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template uint3_t ns, template octetstring l3,
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boolean m := false) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlI(nr, ns, p),
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len := ?,
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m := m,
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el := 1,
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payload := l3,
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padding := ?
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}
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}
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template (value) LapdmFrame ts_LAPDm_I(LapdmSapi sapi, boolean c_r, boolean p, uint3_t nr,
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uint3_t ns, octetstring l3, boolean m := false) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlI(nr, ns, p),
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len := 0,
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m := m,
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el := 1,
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payload := l3,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_RR(template LapdmSapi sapi, template boolean c_r,
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template boolean p, template uint3_t nr) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlRR(nr, p),
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len := 0,
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m := false,
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el := 1,
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payload := ''O,
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padding := ?
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}
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}
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template (value) LapdmFrame ts_LAPDm_RR(LapdmSapi sapi, boolean c_r,
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boolean p, uint3_t nr) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlRR(nr, p),
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len := 0,
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m := false,
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el := 1,
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payload := ''O,
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padding := ''O
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}
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}
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template LapdmFrame tr_LAPDm_REJ(template LapdmSapi sapi, template boolean c_r,
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template boolean p, template uint3_t nr) := {
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ab := {
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addr := tr_LapdmAddr(sapi, c_r),
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ctrl := tr_LapdmCtrlREJ(nr, p),
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len := 0,
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m := false,
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el := 1,
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payload := ''O,
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padding := ?
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}
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}
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template (value) LapdmFrame ts_LAPDm_REJ(LapdmSapi sapi, boolean c_r,
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boolean p, uint3_t nr) := {
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ab := {
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addr := ts_LapdmAddr(sapi, c_r),
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ctrl := ts_LapdmCtrlREJ(nr, p),
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len := 0,
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m := false,
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el := 1,
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payload := ''O,
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padding := ''O
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}
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}
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} with { encode "RAW"; /*variant "FIELDORDER(msb)" */}
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