Unable to get Notification response from BLE device for non-standard Service and Characteristics UUIDs

Hello,

I’m using the DUSUN Bluetooth Gateway DSGW-210 to connect some BLE devices, read data and send the data to Cloud servers. One of my devices provides data Notification using Service and Characteristics through custom services with custom UUIDs. I have been following this document (ble2Mqtt message API v1.8.pdf - Google Drive) to send BLE commands. This document shows the Services and Characteristics are of 4 characters. Can I send the whole UUID of the Services and Characteristics instead of the 4 characters in the BLE command? I don’t seem to get any read/notify/indicate response from the device for custom UUIDs. I tried the same from luci website but I get code 104 which means characteristic not found. But the characteristics and services exist in the device.