From ee2fabaf3f571e6602dfecdf67b8542ab20c0fad Mon Sep 17 00:00:00 2001
From: Olivier Martin <olivier@labapart.com>
Date: Tue, 14 Mar 2017 22:51:06 +0100
Subject: [PATCH] Introduced 'gattlib_write_char_by_uuid'

---
 bluez/gattlib_read_write.c       | 13 +++++++++++++
 examples/read_write/read_write.c | 25 +------------------------
 include/gattlib.h                |  1 +
 3 files changed, 15 insertions(+), 24 deletions(-)

diff --git a/bluez/gattlib_read_write.c b/bluez/gattlib_read_write.c
index 6694735..6f249ba 100644
--- a/bluez/gattlib_read_write.c
+++ b/bluez/gattlib_read_write.c
@@ -181,3 +181,16 @@ int gattlib_write_char_by_handle(gatt_connection_t* connection, uint16_t handle,
 
 	return 0;
 }
+
+int gattlib_write_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, void* buffer, size_t buffer_len) {
+	uint16_t handle = 0;
+	int ret;
+
+	ret = get_handle_from_uuid(connection, uuid, &handle);
+	if (ret) {
+		fprintf(stderr, "Fail to find handle for UUID.\n");
+		return ret;
+	}
+
+	return gattlib_write_char_by_handle(connection, handle, buffer, sizeof(buffer));
+}
diff --git a/examples/read_write/read_write.c b/examples/read_write/read_write.c
index db03c74..9332372 100644
--- a/examples/read_write/read_write.c
+++ b/examples/read_write/read_write.c
@@ -82,30 +82,7 @@ int main(int argc, char *argv[]) {
 			printf("%02x ", buffer[i]);
 		printf("\n");
 	} else {
-		uint16_t handle = 0;
-
-		// Look for handle for the corresponding UUID
-		gattlib_characteristic_t* characteristics;
-		int characteristic_count;
-		ret = gattlib_discover_char(connection, &characteristics, &characteristic_count);
-		if (ret) {
-			fprintf(stderr, "Fail to discover characteristic.\n");
-			return 1;
-		}
-
-		for (i = 0; i < characteristic_count; i++) {
-			if (gattlib_uuid_cmp(&characteristics[i].uuid, &g_uuid) == 0) {
-				handle = characteristics[i].value_handle;
-				break;
-			}
-		}
-		if (handle == 0) {
-			fprintf(stderr, "Fail to find handle for UUID.\n");
-			return 1;
-		}
-		free(characteristics);
-
-		ret = gattlib_write_char_by_handle(connection, handle, buffer, sizeof(buffer));
+		ret = gattlib_write_char_by_uuid(connection, &g_uuid, buffer, sizeof(buffer));
 		assert(ret == 0);
 	}
 
diff --git a/include/gattlib.h b/include/gattlib.h
index 3860514..57e7f33 100644
--- a/include/gattlib.h
+++ b/include/gattlib.h
@@ -139,6 +139,7 @@ int gattlib_discover_desc(gatt_connection_t* connection, gattlib_descriptor_t**
 int gattlib_read_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, void* buffer, size_t buffer_len);
 int gattlib_read_char_by_uuid_async(gatt_connection_t* connection, uuid_t* uuid, gatt_read_cb_t gatt_read_cb);
 
+int gattlib_write_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, void* buffer, size_t buffer_len);
 int gattlib_write_char_by_handle(gatt_connection_t* connection, uint16_t handle, void* buffer, size_t buffer_len);
 
 void gattlib_register_notification(gatt_connection_t* connection, gattlib_event_handler_t notification_handler, void* user_data);