diff --git a/main/ble_spp_server_demo.c b/main/ble_spp_server_demo.c
index 7c6ef41..4c2321e 100644
--- a/main/ble_spp_server_demo.c
+++ b/main/ble_spp_server_demo.c
@@ -37,8 +37,23 @@ static uint16_t table_handle_m;
 #define SAMPLE_DEVICE_NAME s_module->bleName  // The Device Name Characteristics in GAP
 #define SPP_SVC_INST_ID 0
 
+static const uint8_t spp_service_uuid128[16] = {
+    /* LSB <--------------------------------------------------------------------------------> MSB */
+    0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x01, 0x00, 0x40, 0x6E,  //
+};
+
+// static const uint8_t spp_char_uuid128_rx[16] = {
+//     /* LSB <--------------------------------------------------------------------------------> MSB */
+//     0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x02, 0x00, 0x40, 0x6E,  //
+// };
+
+// static const uint8_t spp_char_uuid128_tx[16] = {
+//     /* LSB <--------------------------------------------------------------------------------> MSB */
+//     0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x03, 0x00, 0x40, 0x6E,  //
+// };
+
 /// SPP Service
-static const uint16_t spp_service_uuid = 0xABF0;
+// static const uint16_t spp_service_uuid = 0xABF0;
 /// Characteristic UUID
 #define ESP_GATT_UUID_SPP_DATA_RECEIVE 0xABF1
 #define ESP_GATT_UUID_SPP_DATA_NOTIFY 0xABF2
@@ -174,7 +189,8 @@ static const uint8_t spp_heart_beat_ccc[2] = {0x00, 0x00};
 /// Full HRS Database Description - Used to add attributes into the database
 static const esp_gatts_attr_db_t spp_gatt_db[SPP_IDX_NB] = {
     // SPP -  Service Declaration
-    [SPP_IDX_SVC] = {{ESP_GATT_AUTO_RSP}, {ESP_UUID_LEN_16, (uint8_t *)&primary_service_uuid, ESP_GATT_PERM_READ, sizeof(spp_service_uuid), sizeof(spp_service_uuid), (uint8_t *)&spp_service_uuid}},
+    [SPP_IDX_SVC] = {{ESP_GATT_AUTO_RSP},
+                     {ESP_UUID_LEN_16, (uint8_t *)&primary_service_uuid, ESP_GATT_PERM_READ, sizeof(spp_service_uuid128), sizeof(spp_service_uuid128), (uint8_t *)&spp_service_uuid128}},
 
     // SPP -  data receive characteristic Declaration
     [SPP_IDX_SPP_DATA_RECV_CHAR] = {{ESP_GATT_AUTO_RSP},