Change in osmo-bts[master]: cbch: Implement handling of "Schedule" message

[Harald Welte]

Harald Welte has uploaded this change for review. ( https://gerrit.osmocom.org/14090


Change subject: cbch: Implement handling of "Schedule" message
......................................................................

cbch: Implement handling of "Schedule" message

The first block of "schedule" messages must be advertised with
a special sequence number coding, see Table 1 of 3GPP TS 44.012.

Change-Id: I473edf698eba7ff5008f2fd1ec1776f0aa013858
Closes: OS#4012
---
M src/common/cbch.c
1 file changed, 10 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/90/14090/1

diff --git a/src/common/cbch.c b/src/common/cbch.c
index c628cb5..cde1a0c 100644
--- a/src/common/cbch.c
+++ b/src/common/cbch.c
@@ -1,6 +1,6 @@
 /* Cell Broadcast routines */
 
-/* (C) 2014 by Harald Welte <laforge at gnumonks.org>
+/* (C) 2014,2018-2019 by Harald Welte <laforge at gnumonks.org>
  *
  * All Rights Reserved
  *
@@ -31,6 +31,7 @@
 struct smscb_msg {
 	struct llist_head list;		/* list in smscb_state.queue */
 
+	bool is_schedule;		/* is this a schedule message? */
 	uint8_t msg[GSM412_MSG_LEN];	/* message buffer */
 	uint8_t next_seg;		/* next segment number */
 	uint8_t num_segs;		/* total number of segments */
@@ -78,7 +79,11 @@
 	memcpy(out, &msg->msg[msg->next_seg * GSM412_BLOCK_LEN], to_copy);
 
 	/* set + increment sequence number */
-	block_type->seq_nr = msg->next_seg++;
+	if (msg->next_seg == 0 && msg->is_schedule) {
+		block_type->seq_nr = 8;	/* first schedule block */
+		msg->next_seg++;
+	} else
+		block_type->seq_nr = msg->next_seg++;
 
 	/* determine if this is the last block */
 	if (block_type->seq_nr + 1 == msg->num_segs)
@@ -126,6 +131,9 @@
 	/* next segment is first segment */
 	scm->next_seg = 0;
 
+	if (cmd_type.command == RSL_CB_CMD_TYPE_SCHEDULE)
+		scm->is_schedule = true;
+
 	switch (cmd_type.command) {
 	case RSL_CB_CMD_TYPE_NORMAL:
 	case RSL_CB_CMD_TYPE_SCHEDULE:

-- 
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I473edf698eba7ff5008f2fd1ec1776f0aa013858
Gerrit-Change-Number: 14090
Gerrit-PatchSet: 1
Gerrit-Owner: Harald Welte <laforge at gnumonks.org>
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