# Bluetooth Low Energy pairing and connecting example for uFR Online device
Android Java Bluetooth Low Energy pairing and connecting example for uFR Online device.
Programmatically BLE connection without user interaction is possible if BLE security mode is disabled.
## How to enable BLE mode?
1.Open uFR Online WEB frontend settings page and login.
2.Open other settings.
3.If the reader is working in master mode, switch it to slave mode.
4.Navigate to Bluetooth Low Energy section.
5.Click on the section to enable BLE mode.
6.BLE security section will be shown.
7.Navigate to the next page for more details about BLE security modes.
8.Click save and restart.
9.After restart, light blue light will blink.
Notes.
*Light blue blinking LEDs indicates that reader is waiting for smartphone or other BLE capable device to initiate a connection. Device is visible also as a WiFi Access point.
*浅蓝色的稳定LEDs indicate that the reader is already connected. Connected devices are not visible on BLE scanning. Device is not visible as a WiFi Access point.
## BLE Security modes
There are three BLE security modes. Details about all three are shown in table 1. Disabled security means that there is no open security channel and MITM protection.
|*| Security disabled | Security enabled and PIN is setted to 0 | Security enabled and PIN is 6-digit long |
# BLE pairing and connecting example for uFR Online device
Android Java BLE pairing and connecting example for uFR Online device.
Programmatically BLE connection without user interaction is possible if BLE security mode is disabled.
## How to enable BLE mode?
1.Open uFR Online WEB frontend settings page and login.
2.Open other settings.
3.If the reader is working in master mode, switch it to slave mode.
4.Navigate to BLE section.
5.Click on the section to enable BLE mode.
6.BLE security section will be shown.
7.Navigate to the next page for more details about BLE security modes.
8.Click save and restart.
9.After restart, light blue light will blink.
Notes.
*Light blue blinking LEDs indicates that reader is waiting for smartphone or other BLE capable device to initiate a connection. Device is visible also as a WiFi Access point.
*浅蓝色的稳定LEDs indicate that the reader is already connected. Connected devices are not visible on BLE scanning. Device is not visible as a WiFi Access point.
## BLE Security modes
There are three BLE security modes. Details about all three are shown in table 1. Disabled security means that there is no open security channel and MITM protection.
|*| Security disabled | Security enabled and PIN is setted to 0 | Security enabled and PIN is 6-digit long |
