This is an optional characteristic from the Current Time Service. From
the spec:
"The Local Time Information characteristic returns the local time
information that includes time zone and DST offset when read using the
GATT Read Characteristic Value sub-procedure."
---
time/server.c | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/time/server.c b/time/server.c
index 0e2de2a..48a06c0 100644
--- a/time/server.c
+++ b/time/server.c
@@ -40,6 +40,7 @@
#define CURRENT_TIME_SVC_UUID 0x1805
+#define LOCAL_TIME_INFO_CHR_UUID 0x2A0F
#define CT_TIME_CHR_UUID 0x2A2B
static int encode_current_time(uint8_t value[10])
@@ -88,6 +89,27 @@ static uint8_t current_time_read(struct attribute *a, gpointer user_data)
return 0;
}
+static uint8_t local_time_info_read(struct attribute *a, gpointer user_data)
+{
+ uint8_t value[2];
+
+ DBG("a=%p", a);
+
+ tzset();
+
+ /* FIXME: POSIX "daylight" variable only indicates whether there is DST
+ * for the local time or not. The offset is unknown. */
+ value[0] = daylight ? 0xff : 0x00;
+
+ /* Convert POSIX "timezone" (seconds West of GMT) to Time Profile
+ * format (offset from UTC in number of 15 minutes increments). */
+ value[1] = (uint8_t) (-1 * timezone / (60 * 15));
+
+ attrib_db_update(a->handle, NULL, value, sizeof(value), NULL);
+
+ return 0;
+}
+
static void register_current_time_service(void)
{
/* Current Time service */
@@ -98,6 +120,13 @@ static void register_current_time_service(void)
ATT_CHAR_PROPER_NOTIFY,
GATT_OPT_CHR_VALUE_CB, ATTRIB_READ,
current_time_read,
+
+ /* Local Time Information characteristic */
+ GATT_OPT_CHR_UUID, LOCAL_TIME_INFO_CHR_UUID,
+ GATT_OPT_CHR_PROPS, ATT_CHAR_PROPER_READ,
+ GATT_OPT_CHR_VALUE_CB, ATTRIB_READ,
+ local_time_info_read,
+
GATT_OPT_INVALID);
}
--
1.7.0.4
--
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