Add support for the Current Time Service (CTS). From the spec:
"This service defines how the current time can be exposed using the
Generic Attribute Profile (GATT)."
---
time/server.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/time/server.c b/time/server.c
index 89cc460..0e2de2a 100644
--- a/time/server.c
+++ b/time/server.c
@@ -26,10 +26,85 @@
#include <config.h>
#endif
+#include <glib.h>
+#include <time.h>
+#include <errno.h>
+#include <bluetooth/uuid.h>
+
+#include "att.h"
+#include "gattrib.h"
+#include "attrib-server.h"
+#include "gatt-service.h"
+#include "log.h"
#include "server.h"
+#define CURRENT_TIME_SVC_UUID 0x1805
+
+#define CT_TIME_CHR_UUID 0x2A2B
+
+static int encode_current_time(uint8_t value[10])
+{
+ struct timespec tp;
+ struct tm tm;
+
+ if (clock_gettime(CLOCK_REALTIME, &tp) == -1) {
+ int err = errno;
+
+ error("clock_gettime: %s", strerror(err));
+ return -err;
+ }
+
+ if (localtime_r(&tp.tv_sec, &tm) == NULL) {
+ error("localtime_r() failed");
+ /* localtime_r() does not set errno */
+ return -EINVAL;
+ }
+
+ att_put_u16(1900 + tm.tm_year, &value[0]); /* Year */
+ value[2] = tm.tm_mon + 1; /* Month */
+ value[3] = tm.tm_mday; /* Day */
+ value[4] = tm.tm_hour; /* Hours */
+ value[5] = tm.tm_min; /* Minutes */
+ value[6] = tm.tm_sec; /* Seconds */
+ value[7] = tm.tm_wday == 0 ? 7 : tm.tm_wday; /* Day of Week */
+ /* From Time Profile spec: "The number of 1/256 fractions of a second."
+ * In 1s there are 256 fractions, in 1ns there are 256/10^9 fractions.
+ * To avoid integer overflow, we use the equivalent 1/3906250 ratio. */
+ value[8] = tp.tv_nsec / 3906250; /* Fractions256 */
+ value[9] = 0x00; /* Adjust Reason */
+
+ return 0;
+}
+
+static uint8_t current_time_read(struct attribute *a, gpointer user_data)
+{
+ uint8_t value[10];
+
+ if (encode_current_time(value) < 0)
+ return ATT_ECODE_IO;
+
+ attrib_db_update(a->handle, NULL, value, sizeof(value), NULL);
+
+ return 0;
+}
+
+static void register_current_time_service(void)
+{
+ /* Current Time service */
+ gatt_service_add(GATT_PRIM_SVC_UUID, CURRENT_TIME_SVC_UUID,
+ /* CT Time characteristic */
+ GATT_OPT_CHR_UUID, CT_TIME_CHR_UUID,
+ GATT_OPT_CHR_PROPS, ATT_CHAR_PROPER_READ |
+ ATT_CHAR_PROPER_NOTIFY,
+ GATT_OPT_CHR_VALUE_CB, ATTRIB_READ,
+ current_time_read,
+ GATT_OPT_INVALID);
+}
+
int time_server_init(void)
{
+ register_current_time_service();
+
return 0;
}
--
1.7.0.4
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