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-rw-r--r--isdb-t/br-rn-VeraCruz293
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+# Channel table for Vera Cruz - RN - Brazil
+# Source: http://www.portalbsd.com.br/terrestres_channels.php?channels=3518
+
+# Physical channel 21
+[RIT]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 515142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 23
+[TV Metropolitano]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 527142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 30
+[Band Natal]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 569142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 32
+[TV Tropical]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 581142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 34
+[InterTV Cabugi]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 593142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 36
+[TV Ponta Negra/RN]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 605142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 39
+[Rede Vida]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 623142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 45
+[TV Canção Nova]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 659142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 47
+[TV Aparecida]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 671142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
+# Physical channel 48
+[TVU Natal]
+ DELIVERY_SYSTEM = ISDBT
+ BANDWIDTH_HZ = 6000000
+ FREQUENCY = 677142857
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ INVERSION = AUTO
+ GUARD_INTERVAL = AUTO
+ TRANSMISSION_MODE = AUTO
+ ISDBT_LAYER_ENABLED = 7
+ ISDBT_SOUND_BROADCASTING = 0
+ ISDBT_SB_SUBCHANNEL_ID = 0
+ ISDBT_SB_SEGMENT_IDX = 0
+ ISDBT_SB_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_FEC = AUTO
+ ISDBT_LAYERA_MODULATION = QAM/AUTO
+ ISDBT_LAYERA_SEGMENT_COUNT = 0
+ ISDBT_LAYERA_TIME_INTERLEAVING = 0
+ ISDBT_LAYERB_FEC = AUTO
+ ISDBT_LAYERB_MODULATION = QAM/AUTO
+ ISDBT_LAYERB_SEGMENT_COUNT = 0
+ ISDBT_LAYERB_TIME_INTERLEAVING = 0
+ ISDBT_LAYERC_FEC = AUTO
+ ISDBT_LAYERC_MODULATION = QAM/AUTO
+ ISDBT_LAYERC_SEGMENT_COUNT = 0
+ ISDBT_LAYERC_TIME_INTERLEAVING = 0
+
02'>502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
/*
    en50221 encoder An implementation for libdvb
    an implementation for the en50221 transport layer

    Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
    Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
    Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)

    This library is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 2.1 of
    the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <time.h>
#include <libdvbmisc/dvbmisc.h>
#include <sys/uio.h>
#include <pthread.h>
#include "en50221_transport.h"
#include "en50221_session.h"
#include "en50221_errno.h"
#include "asn_1.h"


// these are the possible session statuses
#define S_STATUS_OPEN                    0x00	// session is opened
#define S_STATUS_CLOSE_NO_RES            0xF0	// could not open session, no proper resource available
#define S_STATUS_CLOSE_RES_UNAVAILABLE   0xF1	// could not open session, resource unavailable
#define S_STATUS_CLOSE_RES_LOW_VERSION   0xF2	// could not open session, resource version too low
#define S_STATUS_CLOSE_RES_BUSY          0xF3	// could not open session, resource is busy

#define ST_OPEN_SESSION_REQ     0x91	// h<--m
#define ST_OPEN_SESSION_RES     0x92	// h-->m
#define ST_CREATE_SESSION       0x93	// h-->m
#define ST_CREATE_SESSION_RES   0x94	// h<--m
#define ST_CLOSE_SESSION_REQ    0x95	// h<->m
#define ST_CLOSE_SESSION_RES    0x96	// h<->m
#define ST_SESSION_NUMBER       0x90	// h<->m

#define S_STATE_IDLE            0x01	// this session is not in use
#define S_STATE_ACTIVE          0x02	// this session is in use
#define S_STATE_IN_CREATION     0x04	// this session waits for a ST_CREATE_SESSION_RES to become active
#define S_STATE_IN_DELETION     0x08	// this session waits for ST_CLOSE_SESSION_RES to become idle again


// for each session we store its identifier, the resource-id
// it is linked to and the callback of the specific resource
struct en50221_session {
	uint8_t state;
	uint32_t resource_id;
	uint8_t slot_id;
	uint8_t connection_id;

	en50221_sl_resource_callback callback;
	void *callback_arg;

	pthread_mutex_t session_lock;
};

struct en50221_session_layer {
	uint32_t max_sessions;
	struct en50221_transport_layer *tl;

	en50221_sl_lookup_callback lookup;
	void *lookup_arg;

	en50221_sl_session_callback session;
	void *session_arg;

	pthread_mutex_t global_lock;
	pthread_mutex_t setcallback_lock;

	int error;

	struct en50221_session *sessions;
};

static void en50221_sl_transport_callback(void *arg, int reason,
					  uint8_t * data,
					  uint32_t data_length,
					  uint8_t slot_id,
					  uint8_t connection_id);
static int en50221_sl_alloc_new_session(struct en50221_session_layer *sl,
					uint32_t resource_id,
					uint8_t slot_id,
					uint8_t connection_id,
					en50221_sl_resource_callback
					callback, void *arg);




struct en50221_session_layer *en50221_sl_create(struct en50221_transport_layer *tl,
						uint32_t max_sessions)
{
	struct en50221_session_layer *sl = NULL;
	uint32_t i;

	// setup structure
	sl = (struct en50221_session_layer *)
	    malloc(sizeof(struct en50221_session_layer));
	if (sl == NULL)
		goto error_exit;
	sl->max_sessions = max_sessions;
	sl->lookup = NULL;
	sl->session = NULL;
	sl->tl = tl;
	sl->error = 0;

	// init the mutex
	pthread_mutex_init(&sl->global_lock, NULL);
	pthread_mutex_init(&sl->setcallback_lock, NULL);

	// create the slots
	sl->sessions = malloc(sizeof(struct en50221_session) * max_sessions);
	if (sl->sessions == NULL)
		goto error_exit;

	// set them up
	for (i = 0; i < max_sessions; i++) {
		sl->sessions[i].state = S_STATE_IDLE;
		sl->sessions[i].callback = NULL;

		pthread_mutex_init(&sl->sessions[i].session_lock, NULL);
	}

	// register ourselves with the transport layer
	en50221_tl_register_callback(tl, en50221_sl_transport_callback, sl);

	return sl;

error_exit:
	en50221_sl_destroy(sl);
	return NULL;
}

void en50221_sl_destroy(struct en50221_session_layer *sl)
{
	uint32_t i;

	if (sl) {
		if (sl->sessions) {
			for (i = 0; i < sl->max_sessions; i++) {
				pthread_mutex_destroy(&sl->sessions[i].session_lock);
			}
			free(sl->sessions);
		}

		pthread_mutex_destroy(&sl->setcallback_lock);
		pthread_mutex_destroy(&sl->global_lock);

		free(sl);
	}
}

int en50221_sl_get_error(struct en50221_session_layer *sl)
{
	return sl->error;
}

void en50221_sl_register_lookup_callback(struct en50221_session_layer *sl,
					 en50221_sl_lookup_callback
					 callback, void *arg)
{
	pthread_mutex_lock(&sl->setcallback_lock);
	sl->lookup = callback;
	sl->lookup_arg = arg;
	pthread_mutex_unlock(&sl->setcallback_lock);
}

void en50221_sl_register_session_callback(struct en50221_session_layer *sl,
					  en50221_sl_session_callback
					  callback, void *arg)
{
	pthread_mutex_lock(&sl->setcallback_lock);
	sl->session = callback;
	sl->session_arg = arg;
	pthread_mutex_unlock(&sl->setcallback_lock);
}

int en50221_sl_create_session(struct en50221_session_layer *sl,
			      int slot_id, uint8_t connection_id,
			      uint32_t resource_id,
			      en50221_sl_resource_callback callback,
			      void *arg)
{
	// lookup next free session_id:
	pthread_mutex_lock(&sl->global_lock);
	int session_number =
	    en50221_sl_alloc_new_session(sl, resource_id, slot_id,
					 connection_id, callback, arg);
	if (session_number == -1) {
		pthread_mutex_unlock(&sl->global_lock);
		return -1;
	}
	pthread_mutex_unlock(&sl->global_lock);

	// make up the header
	uint8_t hdr[8];
	hdr[0] = ST_CREATE_SESSION;
	hdr[1] = 6;
	hdr[2] = resource_id >> 24;
	hdr[3] = resource_id >> 16;
	hdr[4] = resource_id >> 8;
	hdr[5] = resource_id;
	hdr[6] = session_number >> 8;
	hdr[7] = session_number;

	// send this command
	if (en50221_tl_send_data(sl->tl, slot_id, connection_id, hdr, 8)) {
		pthread_mutex_lock(&sl->sessions[session_number].session_lock);
		if (sl->sessions[session_number].state == S_STATE_IN_CREATION) {
			sl->sessions[session_number].state = S_STATE_IDLE;
		}
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

		sl->error = en50221_tl_get_error(sl->tl);
		return -1;
	}
	// ok.
	return session_number;
}

int en50221_sl_destroy_session(struct en50221_session_layer *sl,
			       uint16_t session_number)
{
	if (session_number >= sl->max_sessions) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		return -1;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (!(sl->sessions[session_number].state & (S_STATE_ACTIVE | S_STATE_IN_DELETION))) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return -1;
	}
	// set the state
	sl->sessions[session_number].state = S_STATE_IN_DELETION;

	// get essential details
	uint8_t slot_id = sl->sessions[session_number].slot_id;
	uint8_t connection_id = sl->sessions[session_number].connection_id;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

	//  sendit
	uint8_t hdr[4];
	hdr[0] = ST_CLOSE_SESSION_REQ;
	hdr[1] = 2;
	hdr[2] = session_number >> 8;
	hdr[3] = session_number;
	if (en50221_tl_send_data(sl->tl, slot_id, connection_id, hdr, 4)) {
		pthread_mutex_lock(&sl->sessions[session_number].session_lock);
		if (sl->sessions[session_number].state == S_STATE_IN_DELETION) {
			sl->sessions[session_number].state = S_STATE_IDLE;
		}
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

		sl->error = en50221_tl_get_error(sl->tl);
		return -1;
	}

	return 0;
}

int en50221_sl_send_data(struct en50221_session_layer *sl,
			 uint16_t session_number,
			 uint8_t *data,
			 uint16_t data_length)
{
	if (session_number >= sl->max_sessions) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		return -1;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (sl->sessions[session_number].state != S_STATE_ACTIVE) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return -1;
	}
	// get essential details
	uint8_t slot_id = sl->sessions[session_number].slot_id;
	uint8_t connection_id = sl->sessions[session_number].connection_id;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

	// sendit
	struct iovec iov[2];
	uint8_t hdr[4];
	hdr[0] = ST_SESSION_NUMBER;
	hdr[1] = 2;
	hdr[2] = session_number >> 8;
	hdr[3] = session_number;
	iov[0].iov_base = hdr;
	iov[0].iov_len = 4;
	iov[1].iov_base = data;
	iov[1].iov_len = data_length;
	if (en50221_tl_send_datav(sl->tl, slot_id, connection_id, iov, 2)) {
		sl->error = en50221_tl_get_error(sl->tl);
		return -1;
	}

	return 0;
}

int en50221_sl_send_datav(struct en50221_session_layer *sl,
			  uint16_t session_number,
			  struct iovec *vector,
			  int iov_count)
{
	if (session_number >= sl->max_sessions) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		return -1;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (sl->sessions[session_number].state != S_STATE_ACTIVE) {
		sl->error = EN50221ERR_BADSESSIONNUMBER;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return -1;
	}
	if (iov_count > 9) {
		sl->error = EN50221ERR_IOVLIMIT;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return -1;
	}
	uint8_t slot_id = sl->sessions[session_number].slot_id;
	uint8_t connection_id = sl->sessions[session_number].connection_id;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

	// make up the header
	struct iovec out_iov[10];
	uint8_t hdr[4];
	hdr[0] = ST_SESSION_NUMBER;
	hdr[1] = 2;
	hdr[2] = session_number >> 8;
	hdr[3] = session_number;
	out_iov[0].iov_base = hdr;
	out_iov[0].iov_len = 4;

	// make up the data
	memcpy(&out_iov[1], vector, iov_count * sizeof(struct iovec));

	// send this command
	if (en50221_tl_send_datav(sl->tl, slot_id, connection_id, out_iov, iov_count + 1)) {
		sl->error = en50221_tl_get_error(sl->tl);
		return -1;
	}
	return 0;
}

int en50221_sl_broadcast_data(struct en50221_session_layer *sl,
			      int slot_id, uint32_t resource_id,
			      uint8_t *data, uint16_t data_length)
{
	uint32_t i;

	for (i = 0; i < sl->max_sessions; i++) {
		pthread_mutex_lock(&sl->sessions[i].session_lock);

		if (sl->sessions[i].state != S_STATE_ACTIVE) {
			pthread_mutex_unlock(&sl->sessions[i].session_lock);
			continue;
		}
		if ((slot_id != -1)
		    && (slot_id != sl->sessions[i].slot_id)) {
			pthread_mutex_unlock(&sl->sessions[i].session_lock);
			continue;
		}

		if (sl->sessions[i].resource_id == resource_id) {
			pthread_mutex_unlock(&sl->sessions[i].session_lock);
			en50221_sl_send_data(sl, i, data, data_length);
		} else {
			pthread_mutex_unlock(&sl->sessions[i].session_lock);
		}
	}

	return 0;
}



static void en50221_sl_handle_open_session_request(struct en50221_session_layer *sl,
						   uint8_t *data,
						   uint32_t data_length,
						   uint8_t slot_id,
						   uint8_t connection_id)
{
	// check
	if (data_length < 5) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	if (data[0] != 4) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	// get the resource id
	uint32_t requested_resource_id =
	    (data[1] << 24) | (data[2] << 16) | (data[3] << 8) | data[4];

	// get lookup callback details
	pthread_mutex_lock(&sl->setcallback_lock);
	en50221_sl_lookup_callback lcb = sl->lookup;
	void *lcb_arg = sl->lookup_arg;
	pthread_mutex_unlock(&sl->setcallback_lock);

	// first of all, lookup this resource id
	int status = S_STATUS_CLOSE_NO_RES;
	en50221_sl_resource_callback resource_callback = NULL;
	void *resource_arg = NULL;
	uint32_t connected_resource_id;
	if (lcb) {
		status =
		    lcb(lcb_arg, slot_id, requested_resource_id,
			&resource_callback, &resource_arg,
			&connected_resource_id);
		switch (status) {
		case 0:
			status = S_STATUS_OPEN;
			break;

		case -1:
			status = S_STATUS_CLOSE_NO_RES;
			break;

		case -2:
			status = S_STATUS_CLOSE_RES_LOW_VERSION;
			break;

		case -3:
			status = S_STATUS_CLOSE_RES_UNAVAILABLE;
			break;
		}
	}
	// if we found it, get a new session for it
	int session_number = -1;
	if (status == S_STATUS_OPEN) {
		// lookup next free session_id:
		pthread_mutex_lock(&sl->global_lock);
		session_number =
		    en50221_sl_alloc_new_session(sl, connected_resource_id,
						 slot_id, connection_id,
						 resource_callback,
						 resource_arg);
		pthread_mutex_unlock(&sl->global_lock);

		if (session_number == -1) {
			status = S_STATUS_CLOSE_NO_RES;
		} else {
			// inform upper layers/ check availability
			pthread_mutex_lock(&sl->setcallback_lock);
			en50221_sl_session_callback cb = sl->session;
			void *cb_arg = sl->session_arg;
			pthread_mutex_unlock(&sl->setcallback_lock);
			if (cb) {
				if (cb(cb_arg, S_SCALLBACK_REASON_CAMCONNECTING,
				       slot_id, session_number,
				       connected_resource_id)) {
					status = S_STATUS_CLOSE_RES_BUSY;
				}
			} else {
				status = S_STATUS_CLOSE_RES_UNAVAILABLE;
			}
		}
	}
	// send response
	uint8_t hdr[9];
	hdr[0] = ST_OPEN_SESSION_RES;
	hdr[1] = 7;
	hdr[2] = status;
	hdr[3] = connected_resource_id >> 24;
	hdr[4] = connected_resource_id >> 16;
	hdr[5] = connected_resource_id >> 8;
	hdr[6] = connected_resource_id;
	hdr[7] = session_number >> 8;
	hdr[8] = session_number;
	if (en50221_tl_send_data(sl->tl, slot_id, connection_id, hdr, 9)) {
		print(LOG_LEVEL, ERROR, 1,
		      "Transport layer error %i occurred\n",
		      en50221_tl_get_error(sl->tl));
		status = S_STATUS_CLOSE_NO_RES;
		// fallthrough
	}
	// inform upper layers what happened
	if (session_number != -1) {
		// setup session state apppropriately from upper layer response
		pthread_mutex_lock(&sl->sessions[session_number].session_lock);
		if (status != S_STATUS_OPEN) {
			sl->sessions[session_number].state = S_STATE_IDLE;
		} else {
			sl->sessions[session_number].state = S_STATE_ACTIVE;
		}
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

		// tell upper layers
		if (sl->sessions[session_number].state == S_STATE_ACTIVE) {
			pthread_mutex_lock(&sl->setcallback_lock);
			en50221_sl_session_callback cb = sl->session;
			void *cb_arg = sl->session_arg;
			pthread_mutex_unlock(&sl->setcallback_lock);

			if (status == S_STATUS_OPEN) {
				if (cb)
					cb(cb_arg,
					   S_SCALLBACK_REASON_CAMCONNECTED,
					   slot_id, session_number,
					   connected_resource_id);
			} else {
				sl->sessions[session_number].state =
				    S_STATE_IDLE;
				if (cb)
					cb(cb_arg,
					   S_SCALLBACK_REASON_CAMCONNECTFAIL,
					   slot_id, session_number,
					   connected_resource_id);
			}
		}
	}
}

static void en50221_sl_handle_close_session_request(struct en50221_session_layer *sl,
						    uint8_t * data,
						    uint32_t data_length,
						    uint8_t slot_id,
						    uint8_t connection_id)
{
	// check
	if (data_length < 3) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	if (data[0] != 2) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	// extract session number
	uint16_t session_number = (data[1] << 8) | data[2];

	// check session number is ok
	uint8_t code = 0x00;
	uint32_t resource_id = 0;
	if (session_number >= sl->max_sessions) {
		code = 0xF0;	// session close error
		print(LOG_LEVEL, ERROR, 1, "Received bad session id %i\n",
		      slot_id);
	} else {
		pthread_mutex_lock(&sl->sessions[session_number].
				   session_lock);
		if (slot_id != sl->sessions[session_number].slot_id) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received unexpected session on invalid slot %i\n",
			      slot_id);
			code = 0xF0;	// session close error
		}
		if (connection_id != sl->sessions[session_number].connection_id) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received unexpected session on invalid slot %i\n",
			      slot_id);
			code = 0xF0;	// session close error
		}
		if (!(sl->sessions[session_number].state & (S_STATE_ACTIVE | S_STATE_IN_DELETION))) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received unexpected session on invalid slot %i\n",
			      slot_id);
			code = 0xF0;	// session close error
		}

		if (code == 0x00) {
			sl->sessions[session_number].state = S_STATE_IDLE;
			code = 0x00;	// close ok
		}
		resource_id = sl->sessions[session_number].resource_id;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
	}

	// make up the response
	uint8_t hdr[5];
	hdr[0] = ST_CLOSE_SESSION_RES;
	hdr[1] = 3;
	hdr[2] = code;
	hdr[3] = session_number >> 8;
	hdr[4] = session_number;

	// sendit
	if (en50221_tl_send_data(sl->tl, slot_id, connection_id, hdr, 5)) {
		print(LOG_LEVEL, ERROR, 1,
		      "Transport layer reports error %i on slot %i\n",
		      en50221_tl_get_error(sl->tl), slot_id);
	}
	// callback to announce destruction to resource if it was ok
	if (code == 0x00) {
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);

		if (cb)
			cb(cb_arg, S_SCALLBACK_REASON_CLOSE, slot_id,
			   session_number, resource_id);
	}
}

static void en50221_sl_handle_create_session_response(struct en50221_session_layer *sl,
						      uint8_t * data,
						      uint32_t data_length,
						      uint8_t slot_id,
						      uint8_t connection_id)
{
	// check
	if (data_length < 8) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	if (data[0] != 7) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	// extract session number
	uint16_t session_number = (data[5] << 8) | data[6];

	// check session number is ok
	if (session_number >= sl->max_sessions) {
		print(LOG_LEVEL, ERROR, 1, "Received bad session id %i\n",
		      slot_id);
		return;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (slot_id != sl->sessions[session_number].slot_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (connection_id != sl->sessions[session_number].connection_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (sl->sessions[session_number].state != S_STATE_IN_CREATION) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	// extract status
	if (data[1] != S_STATUS_OPEN) {
		print(LOG_LEVEL, ERROR, 1,
		      "Session creation failed 0x%02x\n", data[1]);
		sl->sessions[session_number].state = S_STATE_IDLE;
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

		// inform upper layers
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);
		if (cb)
			cb(cb_arg, S_SCALLBACK_REASON_CONNECTFAIL, slot_id,
			   session_number,
			   sl->sessions[session_number].resource_id);
		return;
	}
	// set it active
	sl->sessions[session_number].state = S_STATE_ACTIVE;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

	// inform upper layers
	pthread_mutex_lock(&sl->setcallback_lock);
	en50221_sl_session_callback cb = sl->session;
	void *cb_arg = sl->session_arg;
	pthread_mutex_unlock(&sl->setcallback_lock);
	if (cb)
		cb(cb_arg, S_SCALLBACK_REASON_CONNECTED, slot_id,
		   session_number,
		   sl->sessions[session_number].resource_id);
}

static void en50221_sl_handle_close_session_response(struct en50221_session_layer *sl,
						     uint8_t *data,
						     uint32_t data_length,
						     uint8_t slot_id,
						     uint8_t connection_id)
{
	// check
	if (data_length < 5) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	if (data[0] != 4) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %02x\n",
		      slot_id);
		return;
	}
	// extract session number
	uint16_t session_number = (data[2] << 8) | data[3];

	// check session number is ok
	if (session_number >= sl->max_sessions) {
		print(LOG_LEVEL, ERROR, 1, "Received bad session id %i\n", slot_id);
		return;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (slot_id != sl->sessions[session_number].slot_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (connection_id != sl->sessions[session_number].connection_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (sl->sessions[session_number].state != S_STATE_IN_DELETION) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	// extract status
	if (data[1] != 0x00) {
		print(LOG_LEVEL, ERROR, 1, "Session close failed 0x%02x\n", data[1]);
		// just fallthrough anyway
	}
	// completed
	sl->sessions[session_number].state = S_STATE_IDLE;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
}

static void en50221_sl_handle_session_package(struct en50221_session_layer *sl,
					      uint8_t *data,
					      uint32_t data_length,
					      uint8_t slot_id,
					      uint8_t connection_id)
{
	// check
	if (data_length < 3) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %i\n",
		      slot_id);
		return;
	}
	if (data[0] != 2) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %i\n",
		      slot_id);
		return;
	}
	// get session number
	uint16_t session_number = (data[1] << 8) | data[2];

	// check it
	if (session_number >= sl->max_sessions) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with bad session_number from module on slot %i\n",
		      slot_id);
		return;
	}

	pthread_mutex_lock(&sl->sessions[session_number].session_lock);
	if (slot_id != sl->sessions[session_number].slot_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (connection_id != sl->sessions[session_number].connection_id) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received unexpected session on invalid slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}
	if (sl->sessions[session_number].state != S_STATE_ACTIVE) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with bad session_number from module on slot %i\n",
		      slot_id);
		pthread_mutex_unlock(&sl->sessions[session_number].session_lock);
		return;
	}

	en50221_sl_resource_callback cb = sl->sessions[session_number].callback;
	void *cb_arg = sl->sessions[session_number].callback_arg;
	uint32_t resource_id = sl->sessions[session_number].resource_id;
	pthread_mutex_unlock(&sl->sessions[session_number].session_lock);

	// there can be > 1 APDU following the package - all for the same session/resource_id tho.
	data += 3;
	data_length -= 3;
	while (data_length) {
		// check length field
		if (data_length < 3) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received invalid sized session package from slot %i\n",
			      slot_id);
			return;
		}
		// parse the APDU's length field
		int length_field_len;
		uint16_t asn_data_length;
		if ((length_field_len = asn_1_decode(&asn_data_length, data + 3, data_length - 3)) < 0) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received invalid sized session package from slot %i\n",
			      slot_id);
			return;
		}
		uint32_t apdu_length = 3 + length_field_len + asn_data_length;

		// check there is enough data
		if (apdu_length > data_length) {
			print(LOG_LEVEL, ERROR, 1,
			      "Received invalid sized session package from slot %i\n",
			      slot_id);
			return;
		}
		// pass the APDU up to the higher layers
		if (cb)
			cb(cb_arg, slot_id, session_number, resource_id, data, apdu_length);

		// next!
		data += apdu_length;
		data_length -= apdu_length;
	}

}

static void en50221_sl_transport_callback(void *arg, int reason,
					  uint8_t *data,
					  uint32_t data_length,
					  uint8_t slot_id,
					  uint8_t connection_id)
{
	struct en50221_session_layer *sl =
	    (struct en50221_session_layer *) arg;
	uint32_t i;

	// deal with the reason for this callback
	switch (reason) {
	case T_CALLBACK_REASON_DATA:
		// fallthrough into rest of this function
		break;

	case T_CALLBACK_REASON_CONNECTIONOPEN:
	{
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);

		if (cb)
			cb(cb_arg, S_SCALLBACK_REASON_TC_CONNECT,
				slot_id, connection_id, 0);
		return;
	}

	case T_CALLBACK_REASON_CAMCONNECTIONOPEN:
	{
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);

		if (cb)
			cb(cb_arg,
				S_SCALLBACK_REASON_TC_CAMCONNECT,
				slot_id, connection_id, 0);
		return;
	}

	case T_CALLBACK_REASON_CONNECTIONCLOSE:
	{
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);

		for (i = 0; i < sl->max_sessions; i++) {
			pthread_mutex_lock(&sl->sessions[i].session_lock);

			if (sl->sessions[i].state == S_STATE_IDLE) {
				pthread_mutex_unlock(&sl->sessions[i].session_lock);
				continue;
			}
			if (sl->sessions[i].connection_id != connection_id) {
				pthread_mutex_unlock(&sl->sessions[i].session_lock);
				continue;
			}

			sl->sessions[i].state = S_STATE_IDLE;

			uint8_t _slot_id = sl->sessions[i].slot_id;
			uint32_t resource_id = sl->sessions[i].resource_id;
			pthread_mutex_unlock(&sl->sessions[i].session_lock);

			if (cb)
				cb(cb_arg, S_SCALLBACK_REASON_CLOSE, _slot_id, i, resource_id);
		}
		return;
	}

	case T_CALLBACK_REASON_SLOTCLOSE:
	{
		pthread_mutex_lock(&sl->setcallback_lock);
		en50221_sl_session_callback cb = sl->session;
		void *cb_arg = sl->session_arg;
		pthread_mutex_unlock(&sl->setcallback_lock);

		for (i = 0; i < sl->max_sessions; i++) {
			pthread_mutex_lock(&sl->sessions[i].session_lock);

			if (sl->sessions[i].state == S_STATE_IDLE) {
				pthread_mutex_unlock(&sl->sessions[i].session_lock);
				continue;
			}
			if (sl->sessions[i].slot_id != slot_id) {
				pthread_mutex_unlock(&sl->sessions[i].session_lock);
				continue;
			}
			sl->sessions[i].state = S_STATE_IDLE;

			uint32_t resource_id = sl->sessions[i].resource_id;
			pthread_mutex_unlock(&sl->sessions[i].session_lock);

			if (cb)
				cb(cb_arg, S_SCALLBACK_REASON_CLOSE, slot_id, i, resource_id);

		}
		return;
	}
	}

	// sanity check data length
	if (data_length < 1) {
		print(LOG_LEVEL, ERROR, 1,
		      "Received data with invalid length from module on slot %i\n",
		      slot_id);
		return;
	}
	// deal with the data
	uint8_t spdu_tag = data[0];
	switch (spdu_tag) {
	case ST_OPEN_SESSION_REQ:
		en50221_sl_handle_open_session_request(sl, data + 1,
						       data_length - 1,
						       slot_id,
						       connection_id);
		break;

	case ST_CLOSE_SESSION_REQ:
		en50221_sl_handle_close_session_request(sl, data + 1,
							data_length - 1,
							slot_id,
							connection_id);
		break;

	case ST_SESSION_NUMBER:
		en50221_sl_handle_session_package(sl, data + 1,
						  data_length - 1, slot_id,
						  connection_id);
		break;

	case ST_CREATE_SESSION_RES:
		en50221_sl_handle_create_session_response(sl, data + 1,
							  data_length - 1,
							  slot_id,
							  connection_id);
		break;

	case ST_CLOSE_SESSION_RES:
		en50221_sl_handle_close_session_response(sl, data + 1,
							 data_length - 1,
							 slot_id,
							 connection_id);
		break;

	default:
		print(LOG_LEVEL, ERROR, 1,
		      "Received unknown session tag %02x from module on slot %i",
		      spdu_tag, slot_id);
		break;
	}
}

static int en50221_sl_alloc_new_session(struct en50221_session_layer *sl,
					uint32_t resource_id,
					uint8_t slot_id,
					uint8_t connection_id,
					en50221_sl_resource_callback
					callback, void *arg)
{
	int session_number = -1;
	uint32_t i;
	for (i = 1; i < sl->max_sessions; i++) {
		if (sl->sessions[i].state == S_STATE_IDLE) {
			session_number = i;
			break;
		}
	}
	if (session_number == -1) {
		sl->error = EN50221ERR_OUTOFSESSIONS;
		return -1;
	}
	// setup the session
	sl->sessions[session_number].state = S_STATE_IN_CREATION;
	sl->sessions[session_number].resource_id = resource_id;
	sl->sessions[session_number].slot_id = slot_id;
	sl->sessions[session_number].connection_id = connection_id;
	sl->sessions[session_number].callback = callback;
	sl->sessions[session_number].callback_arg = arg;

	// ok
	return session_number;
}