一、發現問題

微信小程序報錯：notifyBLECharacteristicValueChange:fail:nodescriptor

二、分析問題

這個提示有點問題，應該是該Characteristic的Descriptor有問題，而不能說nodescriptor。

描述符的類型不能是0x2901的Characteristic User Description。

應該是0x2902的Client Characteristic Configuration

二、解決問題

修改藍牙設備的Descriptor UUID即可。

不同的Descriptor UUID定義如下。

#define ESP_GATT_UUID_CHAR_EXT_PROP                 0x2900          /*  Characteristic Extended Properties */
#define ESP_GATT_UUID_CHAR_DESCRIPTION              0x2901          /*  Characteristic User Description*/
#define ESP_GATT_UUID_CHAR_CLIENT_CONFIG            0x2902          /*  Client Characteristic Configuration */
#define ESP_GATT_UUID_CHAR_SRVR_CONFIG              0x2903          /*  Server Characteristic Configuration */
#define ESP_GATT_UUID_CHAR_PRESENT_FORMAT           0x2904          /*  Characteristic Presentation Format*/
#define ESP_GATT_UUID_CHAR_AGG_FORMAT               0x2905          /*  Characteristic Aggregate Format*/
#define ESP_GATT_UUID_CHAR_VALID_RANGE              0x2906          /*  Characteristic Valid Range */
#define ESP_GATT_UUID_EXT_RPT_REF_DESCR             0x2907          /*  External Report Reference */
#define ESP_GATT_UUID_RPT_REF_DESCR                 0x2908          /*  Report Reference */
#define ESP_GATT_UUID_NUM_DIGITALS_DESCR            0x2909          /*  Number of Digitals */
#define ESP_GATT_UUID_VALUE_TRIGGER_DESCR           0x290A          /*  Value Trigger Setting */
#define ESP_GATT_UUID_ENV_SENSING_CONFIG_DESCR      0x290B          /*  Environmental Sensing Configuration */
#define ESP_GATT_UUID_ENV_SENSING_MEASUREMENT_DESCR 0x290C          /*  Environmental Sensing Measurement */
#define ESP_GATT_UUID_ENV_SENSING_TRIGGER_DESCR     0x290D          /*  Environmental Sensing Trigger Setting */
#define ESP_GATT_UUID_TIME_TRIGGER_DESCR            0x290E          /*  Time Trigger Setting */

修改后，微信小程序的報錯就消失了。

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