From: Chen Ganir <chen.ganir@xxxxxx>
Read the battery level format characteristic descriptor to get the
unique namespace and description values.
---
lib/uuid.h | 1 +
profiles/battery/battery.c | 53 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/lib/uuid.h b/lib/uuid.h
index 8736749..3abdd44 100644
--- a/lib/uuid.h
+++ b/lib/uuid.h
@@ -57,6 +57,7 @@ extern "C" {
#define DEVICE_INFORMATION_UUID "0000180a-0000-1000-8000-00805f9b34fb"
#define BATTERY_SERVICE_UUID "0000180f-0000-1000-8000-00805f9b34fb"
+#define BATTERY_LEVEL_UUID "00002a19-0000-1000-8000-00805f9b34fb"
#define GATT_UUID "00001801-0000-1000-8000-00805f9b34fb"
#define IMMEDIATE_ALERT_UUID "00001802-0000-1000-8000-00805f9b34fb"
diff --git a/profiles/battery/battery.c b/profiles/battery/battery.c
index 8e7e4c5..8bbfaf7 100644
--- a/profiles/battery/battery.c
+++ b/profiles/battery/battery.c
@@ -50,6 +50,8 @@ struct characteristic {
struct gatt_char attr; /* Characteristic */
struct battery *batt; /* Parent Battery Service */
GSList *desc; /* Descriptors */
+ uint8_t ns; /* Battery Namespace */
+ uint16_t description; /* Battery description */
};
struct descriptor {
@@ -98,6 +100,53 @@ static void battery_free(gpointer user_data)
g_free(batt);
}
+static void batterylevel_presentation_format_desc_cb(guint8 status,
+ const guint8 *pdu, guint16 len,
+ gpointer user_data)
+{
+ struct descriptor *desc = user_data;
+ uint8_t value[ATT_MAX_VALUE_LEN];
+ int vlen;
+
+ if (status != 0) {
+ error("Presentation Format desc read failed: %s",
+ att_ecode2str(status));
+ return;
+ }
+
+ vlen = dec_read_resp(pdu, len, value, sizeof(value));
+ if (vlen < 0) {
+ error("Presentation Format desc read failed: Protocol error");
+ return;
+ }
+
+ if (vlen < 7) {
+ error("Presentation Format desc read failed: Invalid range");
+ return;
+ }
+
+ desc->ch->ns = value[4];
+ desc->ch->description = att_get_u16(&value[5]);
+}
+
+static void process_batterylevel_desc(struct descriptor *desc)
+{
+ struct characteristic *ch = desc->ch;
+ char uuidstr[MAX_LEN_UUID_STR];
+ bt_uuid_t btuuid;
+
+ bt_uuid16_create(&btuuid, GATT_CHARAC_FMT_UUID);
+
+ if (bt_uuid_cmp(&desc->uuid, &btuuid) == 0) {
+ gatt_read_char(ch->batt->attrib, desc->handle,
+ batterylevel_presentation_format_desc_cb, desc);
+ return;
+ }
+
+ bt_uuid_to_string(&desc->uuid, uuidstr, MAX_LEN_UUID_STR);
+ DBG("Ignored descriptor %s characteristic %s", uuidstr, ch->attr.uuid);
+}
+
static void discover_desc_cb(guint8 status, const guint8 *pdu, guint16 len,
gpointer user_data)
{
@@ -131,6 +180,7 @@ static void discover_desc_cb(guint8 status, const guint8 *pdu, guint16 len,
desc->uuid = att_get_uuid128(&value[2]);
ch->desc = g_slist_append(ch->desc, desc);
+ process_batterylevel_desc(desc);
}
att_data_list_free(list);
@@ -153,6 +203,9 @@ static void configure_battery_cb(GSList *characteristics, guint8 status,
struct characteristic *ch;
uint16_t start, end;
+ if (g_strcmp0(c->uuid, BATTERY_LEVEL_UUID) != 0)
+ continue;
+
ch = g_new0(struct characteristic, 1);
ch->attr.handle = c->handle;
ch->attr.properties = c->properties;
--
1.7.9.5
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