Android Read/Write BLE devices with RS232 serial port communication

Question

I am developing Android project to communicate with BLE (Bluetooth Low Energy) devices, the device i have following the communication interface is base on RS232 serial port communication.

I am following this https://developer.android.com/guide/topics/connectivity/bluetooth/ble-overview

My device have

Service UUID: 0x1523-1212-efde-1523-785feabcd123

Characteristic: 0x1524-1212-efde-1523-785feabcd123 (write/notify)

but no success in reading

Android document i am following is working with Characteristic UUID=00002A1C-0000-1000-8000-00805f9b34fb

but the required device is not.

Note: want to read data through Android mobile Bluetooth not by OTG or usb cable

what the difference between the 2 UUID's ?

Thank for your help in advance

Here 0x1523 is custom Service UUID defined by the device whereas 0x2a1c is defined as per Bluetooth SIG standards for temperature measurement. You need to connect to the device using device's service UUID. Check this simple BLE library. — Varsha Kulkarni