/*------------------------------------------------------------------------------- * p25p2_vpdu.c * Phase 2 Variable PDU Handling * * LWVMOBILE * 2022-09 DSD-FME Florida Man Edition *-----------------------------------------------------------------------------*/ #include "dsd.h" //MAC message lengths static const uint8_t mac_msg_len[256] = { 0, 7, 8, 7, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //0F 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //1F 0, 14, 15, 0, 0, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //2F 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //3F 9, 7, 9, 0, 9, 8, 9, 0, 10, 10, 9, 0, 10, 0, 0, 0, //4F 0, 0, 0, 0, 9, 7, 0, 0, 10, 0, 7, 0, 10, 8, 14, 7, //5F 9, 9, 0, 0, 9, 0, 0, 9, 10, 0, 7, 10, 10, 7, 0, 9, //6F 9, 29, 9, 9, 9, 9, 10, 13, 9, 9, 9, 11, 9, 9, 0, 0, //7F 8, 0, 0, 7, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //8F 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //9F 16, 0, 0, 11, 13, 11, 11, 11, 10, 0, 0, 0, 0, 0, 0, 0, //AF 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //BF, b0 was 0, set to 17 11, 0, 0, 8, 15, 12, 15, 32, 12, 12, 0, 27, 14, 29, 29, 32, //CF 0, 0, 0, 0, 0, 0, 9, 0, 14, 29, 11, 27, 14, 0, 40, 11, //DF 28, 0, 0, 14, 17, 14, 0, 0, 16, 8, 11, 0, 13, 19, 0, 0, //EF 0, 0, 16, 14, 0, 0, 12, 0, 22, 0, 11, 13, 11, 0, 15, 0 }; //FF //MAC PDU 3-bit Opcodes BBAC (8.4.1) p 123: //0 - reserved //1 - Mac PTT //2 - Mac End PTT //3 - Mac Idle //4 - Mac Active //5 - reserved //6 - Mac Hangtime //7 - reserved //Mac PTT BBAC p80 void process_MAC_VPDU(dsd_opts * opts, dsd_state * state, int type, unsigned long long int MAC[24]) { //handle variable content MAC PDUs (Active, Idle, Hangtime, or Signal) //use type to specify SACCH or FACCH, so we know if we should invert the currentslot when assigning ids etc //b values - 0 = Unique TDMA Message, 1 Phase 1 OSP/ISP abbreviated // 2 = Manufacturer Message, 3 Phase 1 OSP/ISP extended/explicit int len_a = 0; int len_b = mac_msg_len[MAC[1]]; int len_c = 0; //sanity check if (len_b < 19 && type == 1) { len_c = mac_msg_len[MAC[1+len_b]]; } if (len_b < 16 && type == 0) { len_c = mac_msg_len[MAC[1+len_b]]; } int slot = 9; if (type == 1) //0 for F, 1 for S { slot = (state->currentslot ^ 1) & 1; //flip slot internally for SACCH } else slot = state->currentslot; //assigning here if OECI MAC SIGNAL, after passing RS and CRC if (state->p2_is_lcch) { if (slot == 0) state->dmrburstL = 30; else state->dmrburstR = 30; } if (len_b == 0 || len_b > 18) { goto END_PDU; } for (int i = 0; i < 2; i++) { //Group Voice Channel Grant (GRP_V_CH_GRANT) if (MAC[1+len_a] == 0x40) { int svc = MAC[2+len_a]; int channel = (MAC[3+len_a] << 8) | MAC[4+len_a]; int group = (MAC[5+len_a] << 8) | MAC[6+len_a]; int source = (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | MAC[9+len_a]; fprintf (stderr, "\n Group Voice Channel Grant Update"); fprintf (stderr, "\n SVC [%02X] CHAN [%04X] Group [%d] Source [%d]", svc, channel, group, source); process_channel_to_freq (opts, state, channel); } //Unit-to-Unit Voice Service Channel Grant (UU_V_CH_GRANT) if (MAC[1+len_a] == 0x44) { int channel = (MAC[2+len_a] << 8) | MAC[3+len_a]; int target = (MAC[4+len_a] << 16) | (MAC[5+len_a] << 8) | MAC[6+len_a]; int source = (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | MAC[9+len_a]; fprintf (stderr, "\n Unit to Unit Channel Grant"); fprintf (stderr, "\n CHAN [%04X] Source [%d] Target [%d]", channel, source, target); process_channel_to_freq (opts, state, channel); } //Unit-to-Unit Answer Request (UU_ANS_REQ) if (MAC[1+len_a] == 0x45) { int svc = MAC[2+len_a]; int answer = MAC[3+len_a]; int target = (MAC[4+len_a] << 16) | (MAC[5+len_a] << 8) | MAC[6+len_a]; int source = (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | MAC[9+len_a]; fprintf (stderr, "\n Unit to Unit Channel Answer Request"); fprintf (stderr, "\n SVC [%02X] Answer [%02X] Source [%d] Target [%d]", svc, answer, source, target); } //Telephone Interconnect Voice Channel Grant (TELE_INT_CH_GRANT) if (MAC[1+len_a] == 0x48) { fprintf (stderr, "\n Telephone Interconnect Voice Channel Grant (TELE_INT_CH_GRANT)"); } //Telephone Interconnect Voice Channel Grant Update (TELE_INT_CH_GRANT_UPDT) if (MAC[1+len_a] == 0x49) { fprintf (stderr, "\n Telephone Interconnect Voice Channel Grant Update (TELE_INT_CH_GRANT_UPDT)"); } //Synchronization Broadcast (SYNC_BCST) if (MAC[1+len_a] == 0x70) { fprintf (stderr, "\n Synchronization Broadcast (SYNC_BCST)"); } //identifier update VHF/UHF if (MAC[1+len_a] == 0x74) { state->p25_chan_iden = MAC[2+len_a] >> 4; int iden = state->p25_chan_iden; state->p25_chan_type[iden] = 1; int bw_vu = (MAC[2+len_a] & 0xF); state->p25_trans_off[iden] = (MAC[3+len_a] << 6) | (MAC[4+len_a] >> 2); state->p25_chan_spac[iden] = ((MAC[4+len_a] & 0x3) << 8) | MAC[5+len_a]; state->p25_base_freq[iden] = (MAC[6+len_a] << 24) | (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | (MAC[9+len_a] << 0); fprintf (stderr, "\n Identifier Update UHF/VHF\n"); fprintf (stderr, " Channel Identifier [%01X] BW [%01X] Transmit Offset [%04X]\n Channel Spacing [%03X] Base Frequency [%08lX] [%09ld]", state->p25_chan_iden, bw_vu, state->p25_trans_off[iden], state->p25_chan_spac[iden], state->p25_base_freq[iden], state->p25_base_freq[iden] * 5); } //identifier update (Non-TDMA 6.2.22) (Non-VHF-UHF) //with signed offset, bit trans_off >> 8; bit number 9 if (MAC[1+len_a] == 0x7D) { state->p25_chan_iden = MAC[2+len_a] >> 4; int iden = state->p25_chan_iden; state->p25_chan_type[iden] = 1; int bw = ((MAC[2+len_a] & 0xF) << 5) | ((MAC[3+len_a] & 0xF8) >> 2); state->p25_trans_off[iden] = (MAC[3+len_a] << 6) | (MAC[4+len_a] >> 2); state->p25_chan_spac[iden] = ((MAC[4+len_a] & 0x3) << 8) | MAC[5+len_a]; state->p25_base_freq[iden] = (MAC[6+len_a] << 24) | (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | (MAC[9+len_a] << 0); fprintf (stderr, "\n Identifier Update (8.3.1.23)\n"); fprintf (stderr, " Channel Identifier [%01X] BW [%01X] Transmit Offset [%04X]\n Channel Spacing [%03X] Base Frequency [%08lX] [%09ld]", state->p25_chan_iden, bw, state->p25_trans_off[iden], state->p25_chan_spac[iden], state->p25_base_freq[iden], state->p25_base_freq[iden] * 5); } //identifier update for TDMA, Abbreviated if (MAC[1+len_a] == 0x73) { state->p25_chan_iden = MAC[2+len_a] >> 4; int iden = state->p25_chan_iden; state->p25_chan_type[iden] = MAC[2+len_a] & 0xF; state->p25_trans_off[iden] = (MAC[3+len_a] << 6) | (MAC[4+len_a] >> 2); state->p25_chan_spac[iden] = ((MAC[4+len_a] & 0x3) << 8) | MAC[5+len_a]; state->p25_base_freq[iden] = (MAC[6+len_a] << 24) | (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | (MAC[9+len_a] << 0); fprintf (stderr, "\n Identifier Update for TDMA - Abbreviated\n"); fprintf (stderr, " Channel Identifier [%01X] Channel Type [%01X] Transmit Offset [%04X]\n Channel Spacing [%03X] Base Frequency [%08lX] [%09ld]", state->p25_chan_iden, state->p25_chan_type[iden], state->p25_trans_off[iden], state->p25_chan_spac[iden], state->p25_base_freq[iden], state->p25_base_freq[iden] * 5); } //identifier update for TDMA, Extended if (MAC[1+len_a] == 0xF3) { state->p25_chan_iden = MAC[3+len_a] >> 4; int iden = state->p25_chan_iden; state->p25_chan_type[iden] = MAC[3+len_a] & 0xF; state->p25_trans_off[iden] = (MAC[4+len_a] << 6) | (MAC[5+len_a] >> 2); state->p25_chan_spac[iden] = ((MAC[5+len_a] & 0x3) << 8) | MAC[6+len_a]; state->p25_base_freq[iden] = (MAC[7+len_a] << 24) | (MAC[8+len_a] << 16) | (MAC[9+len_a] << 8) | (MAC[10+len_a] << 0); int lwacn = (MAC[11+len_a] << 12) | (MAC[12+len_a] << 4) | ((MAC[13+len_a] & 0xF0) >> 4); int lsysid = ((MAC[13+len_a] & 0xF) << 8) | MAC[14+len_a]; fprintf (stderr, "\n Identifier Update for TDMA - Extended\n"); fprintf (stderr, " Channel Identifier [%01X] Channel Type [%01X] Transmit Offset [%04X]\n Channel Spacing [%03X] Base Frequency [%08lX] [%09ld]", state->p25_chan_iden, state->p25_chan_type[iden], state->p25_trans_off[iden], state->p25_chan_spac[iden], state->p25_base_freq[iden], state->p25_base_freq[iden] * 5); fprintf (stderr, "\n WACN [%04X] SYSID [%04X]", lwacn, lsysid); } //Secondary Control Channel Broadcast, Explicit if (MAC[1+len_a] == 0xE9) { int rfssid = MAC[2+len_a]; int siteid = MAC[3+len_a]; int channelt = (MAC[4+len_a] << 8) | MAC[5+len_a]; int channelr = (MAC[6+len_a] << 8) | MAC[7+len_a]; int sysclass = MAC[8+len_a]; if (1 == 1) //state->p2_is_lcch == 1 { fprintf (stderr, "\n Secondary Control Channel Broadcast - Explicit\n"); fprintf (stderr, " RFSS[%03d] SITE ID [%03X] CHAN-T [%04X] CHAN-R [%04X] SSC [%02X]", rfssid, siteid, channelt, channelr, sysclass); process_channel_to_freq (opts, state, channelt); process_channel_to_freq (opts, state, channelr); } } //Secondary Control Channel Broadcast, Implicit if (MAC[1+len_a] == 0x79) { int rfssid = MAC[2+len_a]; int siteid = MAC[3+len_a]; int channel1 = (MAC[4+len_a] << 8) | MAC[5+len_a]; int sysclass1 = MAC[6+len_a]; int channel2 = (MAC[7+len_a] << 8) | MAC[8+len_a]; int sysclass2 = MAC[9+len_a]; if (1 == 1) //state->p2_is_lcch == 1 { fprintf (stderr, "\n Secondary Control Channel Broadcast - Implicit\n"); fprintf (stderr, " RFSS[%03d] SITE ID [%03X] CHAN1 [%04X] SSC [%02X] CHAN2 [%04X] SSC [%02X]", rfssid, siteid, channel1, sysclass1, channel2, sysclass2); process_channel_to_freq (opts, state, channel1); process_channel_to_freq (opts, state, channel2); } } //Group Voice Channel Grant Update - Implicit if (MAC[1+len_a] == 0x42) { int channel1 = (MAC[2+len_a] << 8) | MAC[3+len_a]; int group1 = (MAC[4+len_a] << 8) | MAC[5+len_a]; int channel2 = (MAC[6+len_a] << 8) | MAC[7+len_a]; int group2 = (MAC[8+len_a] << 8) | MAC[9+len_a]; fprintf (stderr, "\n Group Voice Channel Grant Update - Implicit"); fprintf (stderr, "\n Channel 1 [%04X] Group 1 [%d][%04X]", channel1, group1, group1); if (state->lasttg == group1) { state->p25_vc_freq[0] = process_channel_to_freq (opts, state, channel1); } else if (state->lasttgR == group1) { state->p25_vc_freq[1] = process_channel_to_freq (opts, state, channel1); } else process_channel_to_freq (opts, state, channel1); //only run next channel if not identical to first channel if (group1 != group2) { fprintf (stderr, "\n Channel 2 [%04X] Group 2 [%d][%04X]", channel2, group2, group2); if (state->lasttg == group2) { state->p25_vc_freq[0] = process_channel_to_freq (opts, state, channel2); } else if (state->lasttgR == group2) { state->p25_vc_freq[1] = process_channel_to_freq (opts, state, channel2); } else process_channel_to_freq (opts, state, channel2); } } //Group Voice Channel Grant Update - Explicit if (MAC[1+len_a] == 0xC3) { int svc = MAC[2+len_a]; int channelt = (MAC[3+len_a] << 8) | MAC[4+len_a]; int channelr = (MAC[5+len_a] << 8) | MAC[6+len_a]; int group = (MAC[7+len_a] << 8) | MAC[8+len_a]; fprintf (stderr, "\n Group Voice Channel Grant Update - Explicit"); fprintf (stderr, "\n SVC [%02X] CHAN-T [%04X] CHAN-R [%04X] Group [%d][%04X]", svc, channelt, channelr, group, group); process_channel_to_freq (opts, state, channelt); process_channel_to_freq (opts, state, channelr); if (slot == 0) { state->lasttg = group; } else state->lasttgR = group; } //MFID90 Group Regroup Voice Channel User - Abbreviated if (MAC[1+len_a] == 0x80 && MAC[2+len_a] == 0x90) { int gr = (MAC[4+len_a] << 8) | MAC[5+len_a]; int src = (MAC[6+len_a] << 16) | (MAC[7+len_a] << 8) | MAC[8+len_a]; fprintf (stderr, "\n VCH %d - Super Group %d SRC %d ", slot, gr, src); fprintf (stderr, "MFID90 Group Regroup Voice"); if (slot == 0) { state->lasttg = gr; if (src != 0) state->lastsrc = src; } else { state->lasttgR = gr; if (src != 0) state->lastsrcR = src; } } //MFID90 Group Regroup Voice Channel User - Extended if (MAC[1+len_a] == 0xA0 && MAC[2+len_a] == 0x90) { int gr = (MAC[5+len_a] << 8) | MAC[6+len_a]; int src = (MAC[7+len_a] << 16) | (MAC[8+len_a] << 8) | MAC[9+len_a]; fprintf (stderr, "\n VCH %d - Super Group %d SRC %d ", slot, gr, src); fprintf (stderr, "MFID90 Group Regroup Voice"); if (slot == 0) { state->lasttg = gr; if (src != 0) state->lastsrc = src; } else { state->lasttgR = gr; if (src != 0) state->lastsrcR = src; } } //MFIDA4 Group Regroup Explicit Encryption Command if (MAC[1+len_a] == 0xB0 && MAC[2+len_a] == 0xA4) //&& MAC[2+len_a] == 0xA4 { int len_grg = MAC[3+len_a] & 0x3F; int grg = MAC[4+len_a] >> 5; //3 bits int ssn = MAC[4+len_a] & 0x1F; //5 bits fprintf (stderr, "\n MFIDA4 Group Regroup Explicit Encryption Command\n"); //fprintf (stderr, " LEN [%02X] GRG [%02X]\n", len_grg, grg); if (grg & 0x2) //if grg == wgid //&0x2 according to OP25 { int sg = (MAC[5+len_a] << 8) | MAC[6+len_a]; int key = (MAC[7+len_a] << 8) | MAC[8+len_a]; int alg = MAC[9+len_a]; int t1 = (MAC[10+len_a] << 8) | MAC[11+len_a]; int t2 = (MAC[12+len_a] << 8) | MAC[13+len_a]; int t3 = (MAC[14+len_a] << 8) | MAC[15+len_a]; int t4 = (MAC[16+len_a] << 8) | MAC[17+len_a]; fprintf (stderr, " SG [%05d] KEY [%02X] ALG [%02X]\n ", sg, key, alg); int a = 0; int wgid = 0; //worried a bad decode may cause an oob array crash on this one for (int i = 10; i < len_grg;) { //failsafe to prevent oob array if ( (i + len_a) > 20) { goto END_PDU; } wgid = (MAC[10+len_a+a] << 8) | MAC[11+len_a+a]; fprintf (stderr, "WGID [%02X][%05d] ", wgid, wgid); a = a + 2; i = i + 2; } } else //if grg == wuid { int sg = (MAC[5+len_a] << 8) | MAC[6+len_a]; int key = (MAC[7+len_a] << 8) | MAC[8+len_a]; int t1 = (MAC[9+len_a] << 16) | (MAC[10+len_a] << 8) | MAC[11+len_a]; int t2 = (MAC[12+len_a] << 16) | (MAC[13+len_a] << 8) | MAC[14+len_a]; int t3 = (MAC[15+len_a] << 16) | (MAC[16+len_a] << 8) | MAC[17+len_a]; fprintf (stderr, " SG [%02X] KEY [%02X]", sg, key); fprintf (stderr, " U1 [%02X] U2 [%02X] U3 [%02X] ", t1, t2, t3); } } //1 or 21, group voice channel message, abb and ext if (MAC[1+len_a] == 0x1 || MAC[1+len_a] == 0x21) { int svc = MAC[2+len_a]; int gr = (MAC[3+len_a] << 8) | MAC[4+len_a]; int src = (MAC[5+len_a] << 16) | (MAC[6+len_a] << 8) | MAC[7+len_a]; fprintf (stderr, "\n VCH %d - TG %d SRC %d ", slot, gr, src); fprintf (stderr, "Group Voice"); if (slot == 0) { state->lasttg = gr; if (src != 0) state->lastsrc = src; } else { state->lasttgR = gr; if (src != 0) state->lastsrcR = src; } } //1 or 21, group voice channel message, abb and ext if (MAC[1+len_a] == 0x2 || MAC[1+len_a] == 0x22) { int svc = MAC[2+len_a]; int gr = (MAC[3+len_a] << 16) | (MAC[4+len_a] << 8) | MAC[5+len_a]; int src = (MAC[6+len_a] << 16) | (MAC[7+len_a] << 8) | MAC[8+len_a]; fprintf (stderr, "\n VCH %d - TG %d SRC %d ", slot, gr, src); fprintf (stderr, "Unit to Unit Voice"); if (slot == 0) { state->lasttg = gr; if (src != 0) state->lastsrc = src; } else { state->lasttgR = gr; if (src != 0) state->lastsrcR = src; } } //network status broadcast, abbreviated if (MAC[1+len_a] == 0x7B) { int lra = MAC[2+len_a]; int lwacn = (MAC[3+len_a] << 12) | (MAC[4+len_a] << 4) | ((MAC[5+len_a] & 0xF0) >> 4); int lsysid = ((MAC[5+len_a] & 0xF) << 8) | MAC[6+len_a]; int channel = (MAC[7+len_a] << 8) | MAC[8+len_a]; int sysclass = MAC[9+len_a]; int lcolorcode = ((MAC[10+len_a] & 0xF) << 8) | MAC[11+len_a]; fprintf (stderr, "\n Network Status Broadcast - Abbreviated \n"); fprintf (stderr, " LRA [%02X] WACN [%05X] SYSID [%03X] NAC [%03X] CHAN-T [%04X]", lra, lwacn, lsysid, lcolorcode, channel); state->p25_cc_freq = process_channel_to_freq (opts, state, channel); if (state->p2_hardset == 0 ) //state->p2_is_lcch == 1 shim until CRC is working, prevent bogus data { state->p2_wacn = lwacn; state->p2_sysid = lsysid; state->p2_cc = lcolorcode; } } //network status broadcast, extended if (MAC[1+len_a] == 0xFB) { int lra = MAC[2+len_a]; int lwacn = (MAC[3+len_a] << 12) | (MAC[4+len_a] << 4) | ((MAC[5+len_a] & 0xF0) >> 4); int lsysid = ((MAC[5+len_a] & 0xF) << 8) | MAC[6+len_a]; int channelt = (MAC[7+len_a] << 8) | MAC[8+len_a]; int channelr = (MAC[9+len_a] << 8) | MAC[10+len_a]; int sysclass = MAC[9+len_a]; int lcolorcode = ((MAC[12+len_a] & 0xF) << 8) | MAC[13+len_a]; fprintf (stderr, "\n Network Status Broadcast - Extended \n"); fprintf (stderr, " LRA [%02X] WACN [%05X] SYSID [%03X] NAC [%03X] CHAN-T [%04X] CHAN-R [%04X]", lra, lwacn, lsysid, lcolorcode, channelt, channelr); process_channel_to_freq (opts, state, channelt); process_channel_to_freq (opts, state, channelr); if (state->p2_hardset == 0 ) //state->p2_is_lcch == 1 shim until CRC is working, prevent bogus data { state->p2_wacn = lwacn; state->p2_sysid = lsysid; state->p2_cc = lcolorcode; } } //Adjacent Status Broadcast, abbreviated if (MAC[1+len_a] == 0x7C) { int lra = MAC[2+len_a]; int lsysid = ((MAC[3+len_a] & 0xF) << 8) | MAC[4+len_a]; int rfssid = MAC[5+len_a]; int siteid = MAC[6+len_a]; int channelt = (MAC[7+len_a] << 8) | MAC[8+len_a]; int sysclass = MAC[9+len_a]; if (1 == 1) //state->p2_is_lcch == 1 { fprintf (stderr, "\n Adjacent Status Broadcast - Abbreviated\n"); fprintf (stderr, " LRA [%02X] RFSS[%03d] SYSID [%03X] CHAN-T [%04X] SSC [%02X]", lra, rfssid, lsysid, channelt, sysclass); process_channel_to_freq (opts, state, channelt); } } //Adjacent Status Broadcast, extended if (MAC[1+len_a] == 0xFC) { int lra = MAC[2+len_a]; int lsysid = ((MAC[3+len_a] & 0xF) << 8) | MAC[4+len_a]; int rfssid = MAC[5+len_a]; int siteid = MAC[6+len_a]; int channelt = (MAC[7+len_a] << 8) | MAC[8+len_a]; int channelr = (MAC[9+len_a] << 8) | MAC[10+len_a]; int sysclass = MAC[9+len_a]; if (1 == 1) //state->p2_is_lcch == 1 { fprintf (stderr, "\n Adjacent Status Broadcast - Extended\n"); fprintf (stderr, " LRA [%02X] RFSS[%03d] SYSID [%03X] CHAN-T [%04X] CHAN-R [%04X] SSC [%02X]", lra, rfssid, lsysid, channelt, channelr, sysclass); process_channel_to_freq (opts, state, channelt); process_channel_to_freq (opts, state, channelr); } } if ( (len_b + len_c) < 24 && len_c != 0) { len_a = len_b; } else { goto END_PDU; } } END_PDU: state->p2_is_lcch = 0; //debug printing if (opts->payload == 1 && MAC[1] != 0) //print only if not a null type //&& MAC[1] != 0 //&& MAC[2] != 0 { fprintf (stderr, "%s", KCYN); fprintf (stderr, "\n P25 PDU Payload\n "); for (int i = 0; i < 24; i++) { fprintf (stderr, "[%02llX]", MAC[i]); if (i == 11) fprintf (stderr, "\n "); } fprintf (stderr, "%s", KNRM); } }