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效果如图：app直接显示了我的温度，并且有两位小数，还有温度单位。这是怎么做到的呢？

这次我们仍以TLS8258为例，当然如果是其他蓝牙芯片，配置方式也是大差不差，规则一样的。

#define GATT_CHARACTERISTIC_TYPE_TEMPERATURE (0x2B11) //(0x2A6E)只有2Bytes.(0x2B11) 4Bytes
static const u16 my_debug_ServiceUUID = 0xFFF0;static const u16 my_debug_test_temperature_characteristic_uuid = GATT_CHARACTERISTIC_TYPE_TEMPERATURE;
static const u16 my_debug_test_temperature_characteristic_value_presentation_format_uuid = GATT_UUID_CHAR_PRESENT_FORMAT;
static const u8 my_debug_test_temperature_declaration[5] = {CHAR_PROP_READ | CHAR_PROP_NOTIFY,U16_LO(DebugTestTemperature_CharacteristicValueDeclarationHandle),U16_HI(DebugTestTemperature_CharacteristicValueDeclarationHandle),U16_LO(GATT_CHARACTERISTIC_TYPE_TEMPERATURE),U16_HI(GATT_CHARACTERISTIC_TYPE_TEMPERATURE)
};
static const u8 debug_test_temperature_characteristic_value_presentation_format[7]=
{0x10,//int32_t0xFE,//exponent0x2F,//unit LSB   2F:℃; AC:℉; 05:K0x27,//unit MSB0x01,//bluetooth BIG0x00,//none0x00//none
};
static const u8 debug_test_temperature_characteristic_user_description[] =
{'T','e','m','p','e','r','a','t','u','r','e','-','1'
};
_attribute_data_retention_ static u8 debug_test_temperature_client_characteristic_configuration[2] = {0,0};
_attribute_data_retention_ static u8 debug_test_temperature_characteristic_value[4] = {0x01,0x02,0x03,0x04};//LSB<--->MSB
ble_sts_t server_send_debug_test_temperature_to_client(int32_t temperature)
{debug_test_temperature_characteristic_value[0] = (temperature>>0)&0xFF;debug_test_temperature_characteristic_value[1] = (temperature>>8)&0xFF;debug_test_temperature_characteristic_value[2] = (temperature>>16)&0xFF;debug_test_temperature_characteristic_value[3] = (temperature>>24)&0xFF;if(blc_ll_getCurrentState() == BLS_LINK_STATE_ADV){return 0xFF;}return blc_gatt_pushHandleValueNotify(BLS_CONN_HANDLE,DebugTestTemperature_CharacteristicValueDeclarationHandle,&debug_test_temperature_characteristic_value[0],sizeof(debug_test_temperature_characteristic_value));
}//characteristic 2
static const u16 my_debug_test_temperature2_characteristic_uuid = 0xFFF1;
static const u16 my_debug_test_temperature2_characteristic_value_presentation_format_uuid = GATT_UUID_CHAR_PRESENT_FORMAT;
static const u8 my_debug_test_temperature2_declaration[5] = {CHAR_PROP_READ | CHAR_PROP_NOTIFY,U16_LO(DebugTestTemperature2_CharacteristicValueDeclarationHandle),U16_HI(DebugTestTemperature2_CharacteristicValueDeclarationHandle),U16_LO(GATT_CHARACTERISTIC_TYPE_TEMPERATURE),U16_HI(GATT_CHARACTERISTIC_TYPE_TEMPERATURE)
};
static const u8 debug_test_temperature2_characteristic_value_presentation_format[7]=
{0x10,//int32_t0xFE,//exponent0x2F,//unit LSB   2F:℃; AC:℉; 05:K0x27,//unit MSB0x01,//bluetooth BIG0x00,//none0x00//none
};
static const u8 debug_test_temperature2_characteristic_user_description[] =
{'T','e','m','p','e','r','a','t','u','r','e','-','2'
};
_attribute_data_retention_ static u8 debug_test_temperature2_client_characteristic_configuration[2] = {0,0};
_attribute_data_retention_ static u8 debug_test_temperature2_characteristic_value[4] = {0x01,0x02,0x03,0x04};//LSB<--->MSB
ble_sts_t server_send_debug_test_temperature2_to_client(int32_t temperature)
{debug_test_temperature2_characteristic_value[0] = (temperature>>0)&0xFF;debug_test_temperature2_characteristic_value[1] = (temperature>>8)&0xFF;debug_test_temperature2_characteristic_value[2] = (temperature>>16)&0xFF;debug_test_temperature2_characteristic_value[3] = (temperature>>24)&0xFF;if(blc_ll_getCurrentState() == BLS_LINK_STATE_ADV){return 0xFF;}return blc_gatt_pushHandleValueNotify(BLS_CONN_HANDLE,DebugTestTemperature2_CharacteristicValueDeclarationHandle,&debug_test_temperature2_characteristic_value[0],sizeof(debug_test_temperature2_characteristic_value));
}static const attribute_t my_Attributes[] = {{ATT_END_H - 1, 0,0,0,0,0,0,0},	// total num of attribute// 0x0001 - 0x0007  GAP{7,ATT_PERMISSIONS_READ,2,2,(u8*)(&my_primaryServiceUUID), 	(u8*)(&my_gapServiceUUID), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_devNameCharVal),(u8*)(&my_characterUUID), (u8*)(my_devNameCharVal), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_devName), (u8*)(&my_devNameUUID), (u8*)(my_devName), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_appearanceCharVal),(u8*)(&my_characterUUID), (u8*)(my_appearanceCharVal), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof (my_appearance), (u8*)(&my_appearanceUUID), 	(u8*)(&my_appearance), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_periConnParamCharVal),(u8*)(&my_characterUUID), (u8*)(my_periConnParamCharVal), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof (my_periConnParameters),(u8*)(&my_periConnParamUUID), 	(u8*)(&my_periConnParameters), 0, 0},// 0x0008 - 0x000B GATT{4,ATT_PERMISSIONS_READ,2,2,(u8*)(&my_primaryServiceUUID), 	(u8*)(&my_gattServiceUUID), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_serviceChangeCharVal),(u8*)(&my_characterUUID), 		(u8*)(my_serviceChangeCharVal), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof (serviceChangeVal), (u8*)(&serviceChangeUUID), 	(u8*)(&serviceChangeVal), 0, 0},{0,ATT_PERMISSIONS_RDWR,2,sizeof (serviceChangeCCC),(u8*)(&clientCharacterCfgUUID), (u8*)(serviceChangeCCC), 0, 0},// Battery Service /// 0x002A - 0x002D{4,ATT_PERMISSIONS_READ,2,2,(u8*)(&my_primaryServiceUUID), 	(u8*)(&my_batServiceUUID), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_batCharVal),(u8*)(&my_characterUUID), (u8*)(my_batCharVal), 0, 0},				//prop{0,ATT_PERMISSIONS_READ,2,sizeof(my_batVal),(u8*)(&my_batCharUUID), 	(u8*)(my_batVal), 0, 0},	//value{0,ATT_PERMISSIONS_RDWR,2,sizeof(batteryValueInCCC),(u8*)(&clientCharacterCfgUUID), 	(u8*)(batteryValueInCCC), 0, 0},	//value#if (BLE_OTA_SERVER_ENABLE)// OTA /// 0x002E - 0x0032{5,ATT_PERMISSIONS_READ, 2,16,(u8*)(&my_primaryServiceUUID), 	(u8*)(&my_OtaServiceUUID), 0, 0},{0,ATT_PERMISSIONS_READ, 2, sizeof(my_OtaCharVal),(u8*)(&my_characterUUID), (u8*)(my_OtaCharVal), 0, 0},				//prop{0,ATT_PERMISSIONS_RDWR,16,sizeof(my_OtaData),(u8*)(&my_OtaUUID),	(&my_OtaData), &otaWrite, NULL},				//value{0,ATT_PERMISSIONS_RDWR,2,sizeof(otaDataCCC),(u8*)(&clientCharacterCfgUUID), 	(u8*)(otaDataCCC), 0, 0},				//value{0,ATT_PERMISSIONS_READ, 2,sizeof (my_OtaName),(u8*)(&userdesc_UUID), (u8*)(my_OtaName), 0, 0},
#endif#if(DEBUG_INTERFACE_TO_GATT){11,ATT_PERMISSIONS_READ,2,2,(u8*)(&my_primaryServiceUUID), 	(u8*)(&my_debug_ServiceUUID), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_debug_test_temperature_declaration),(u8*)(&my_characterUUID),(u8*)(my_debug_test_temperature_declaration), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature_characteristic_value),(u8*)(&my_debug_test_temperature_characteristic_uuid), (u8*)(debug_test_temperature_characteristic_value), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature_characteristic_value_presentation_format), (u8*)(&my_debug_test_temperature_characteristic_value_presentation_format_uuid), (u8*)(&debug_test_temperature_characteristic_value_presentation_format), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature_characteristic_user_description), (u8*)(&userdesc_UUID), (u8*)(&debug_test_temperature_characteristic_user_description), 0, 0},{0,ATT_PERMISSIONS_RDWR,2,sizeof(debug_test_temperature_client_characteristic_configuration),(u8*)(&clientCharacterCfgUUID), (u8*)(debug_test_temperature_client_characteristic_configuration), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(my_debug_test_temperature2_declaration),(u8*)(&my_characterUUID),(u8*)(my_debug_test_temperature2_declaration), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature2_characteristic_value),(u8*)(&my_debug_test_temperature2_characteristic_uuid), (u8*)(debug_test_temperature2_characteristic_value), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature2_characteristic_value_presentation_format), (u8*)(&my_debug_test_temperature2_characteristic_value_presentation_format_uuid), (u8*)(&debug_test_temperature2_characteristic_value_presentation_format), 0, 0},{0,ATT_PERMISSIONS_READ,2,sizeof(debug_test_temperature2_characteristic_user_description), (u8*)(&userdesc_UUID), (u8*)(&debug_test_temperature2_characteristic_user_description), 0, 0},{0,ATT_PERMISSIONS_RDWR,2,sizeof(debug_test_temperature2_client_characteristic_configuration),(u8*)(&clientCharacterCfgUUID), (u8*)(debug_test_temperature2_client_characteristic_configuration), 0, 0},
#endif
};

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