spandsp  3.0.0
private/v150_1_sse.h
1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * private/v150_1_sse.h - An implementation of the state signaling events
5  * (SSE), protocol defined in V.150.1 Annex C, less
6  * the packet exchange part
7  *
8  * Written by Steve Underwood <steveu@coppice.org>
9  *
10  * Copyright (C) 2022 Steve Underwood
11  *
12  * All rights reserved.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2, as
16  * published by the Free Software Foundation.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  */
27 
28 #if !defined(_SPANDSP_PRIVATE_V150_1_SSE_H_)
29 #define _SPANDSP_PRIVATE_V150_1_SSE_H_
30 
32 {
33  int reliability_method;
34 
35  int repetition_count; /* Default 3 See V.150.1 C.4.1 */
36  int repetition_interval; /* Defautl 20ms See V.150.1 C.4.1 */
37 
38  int ack_n0count; /* Default 3 See V.150.1 C.4.3.1 */
39  int ack_t0interval; /* Default 10ms See V.150.1 C.4.3.1 */
40  int ack_t1interval; /* Default 300ms See V.150.1 C.4.3.1 */
41 
42  int recovery_n; /* Default 5 See V.150.1 C.5.4.1 */
43  int recovery_t1; /* Default 1s See V.150.1 C.5.4.1 */
44  int recovery_t2; /* Default 1s See V.150.1 C.5.4.1 */
45 
46  span_timestamp_t latest_timer;
47 
48  /* Explicit acknowledgement variables. */
49  bool explicit_ack_enabled;
50 
51  span_timestamp_t recovery_timer_t1; /* See V.150.1 C.5.4.1 */
52  span_timestamp_t recovery_timer_t2; /* See V.150.1 C.5.4.1 */
53  int recovery_counter_n; /* See V.150.1 C.5.4.1 */
54 
55  /* Timer to control repetition transmission */
56  span_timestamp_t repetition_timer; /* See V.150.1 C.4.1 */
57  /* Counter used to control repetition transmission */
58  int repetition_counter; /* See V.150.1 C.4.1 */
59 
60  /* Timer to control sending mode change messages to the remote node */
61  span_timestamp_t ack_timer_t0; /* See V.150.1 C.4.3.1 */
62  /* Timer to recover from lost acknowledgements sent by the remote node */
63  span_timestamp_t ack_timer_t1; /* See V.150.1 C.4.3.1 */
64  /* Counter used to control sending mode change messages to the remote node */
65  int ack_counter_n0; /* See V.150.1 C.4.3.1 */
66  bool force_response;
67 
68  bool immediate_timer;
69 
70  uint8_t last_tx_pkt[256];
71  int last_tx_len;
72 
73  /* The last timestamp received from the remote gateway or endpoint */
74  uint32_t previous_rx_timestamp;
75 
76  v150_1_sse_tx_packet_handler_t tx_packet_handler;
77  void *tx_packet_user_data;
78 };
79 
80 #endif
81 /*- End of file ------------------------------------------------------------*/
Definition: private/v150_1_sse.h:31