Libre bridge
Settings
Hardware Data Source
Libre Bluetooth
Many NFC to Bluetooth bridges are available on the market for Libre sensors.
The original project was developed by Joern: LimiTTer. You need to remember this name as it will appear as the default bridge name when the actual device is not identified. Unless you actually have a LimiTTer (or connect directly a Libre 2), seeing this name means your bridge is not connected to xDrip+.
xDrip+ supports some of them for some sensors.
Libre H, Libre 2/2+ US/CA/AUS are not supported.
You can use Diabox or Juggluco in Libre patched app mode.
Here below a compatibility table for supported bridge devices, for compatible sensors minimum firmware version is indicated.
| Bridge | - Libre 1 / Pro - | - 14 days US - | - Libre 2/2+ EU - |
|---|---|---|---|
| MiaoMiao | Yes |
39* |
39* |
| MiaoMiao 2 | Yes |
7* |
7* |
| MiaoMiao 3 | Yes |
3A* |
3A* |
| Bubble | Yes |
2.6* |
2.6* |
| Bubble mini | Yes |
2.6* |
2.6* |
| Atom | Yes |
Note:
* external OOP add-on required
Bridge settings⌁
If you haven't yet, check xDrip+ will not be put to sleep.
Before trying to connect your bridge verify your settings are correct to avoid frequent disconnections.
Settings
Less Common Settings
Bluetooth Settings
Use settings as shown below to start with.
Bluetooth must be on. Enable Turn Bluetooth on.
Turn Bluetooth on 
Automatically turn on Bluetooth if it is switched off when we try to connect to a Bluetooth device.
Enable the Watchdog but read the info below.
Bluetooth Watchdog
Reset Bluetooth by turning it off then on if we don't get anything within 20 minutes
Enable the Dex Watchdog but read the info below.
Dex Bluetooth Watchdog
Reset Bluetooth by turning it off then on as a way to keep the Dex data source working. Without this, the Dex collector may fail.
Info
Mind the Bluetooth watchdog ang Dex Bluetooth watchdog will turn off, then on your phone Bluetooth, this will lead to a temporary Bluetooth disconnection on all connected devices. You might want to disable this feature if you use AAPS and your bridge/pump doesn't recover automatically Bluetooth connection.
Disable close GATT.
Close GATT on BLE disconnect 
If the Bluetooth watchdog activates too often then you can try unchecking this option to see if it helps.
If your bridge loses connection and scanning Bluetooth allows you to recover, you can try to enable Use scanning. Leave disabled to start.
Use scanning
Scan before connecting on xBridge and Libre Bluetooth.
For Samsung and many Chinese phones you must disable Trust Auto-Connect! If your phone loses connection you should disable it.
Trust auto-connect
Use and trust Android Bluetooth auto-connect feature.
For Android version 8 and above you can enable Use Background Scans. If you lose connection, leave it disabled.
Use Background Scans
Use Android 8+ background scanning feature.
Leave both the options below disabled.
Bluetooth Wakelocks
Older Bluetooth wakelocks which can can drain battery but might be needed for Bluetooth reception.
Constantly reset Bluetooth
Reset Bluetooth by turning it off then on every few minutes! Only select if you are testing. It may disrupt anything else using Bluetooth.
If your bridge is a Transmitter_T or a Droplet enable this else keep it disabled.
Transmitter (PL) support
Experimental support for "Transmitter" device from @FPV-UAV - test only.
If you have connection losses you can enable polling mode. It will not do anything useful but keep the phone Bluetooth awake.
xBridge+ Polling Mode
Experimental support for xBridge+ polling feature.
If your bridge is an old compatible BluCon you can enable this, if you have multiple daily pairing requests, keep it *disabled*.
Note: only BluCon bonds to Android, other bridges don't.
Allow BluCon unbonding
Only suitable for phones which support automatic pairing.
Restart your phone to make sure all parameters are being taken into account.
Connect Bluetooth bridge⌁
Make sure your bridge is not connected to anything else: any other device and any other app.
Scan Bluetooth.
Bluetooth Scan
If scan doesn't start automatically, select SCAN.
If your bridge doesn't show up make sure it's fully charged (or has a new battery) and reset it.
Once visible select it.
If your bridge is a Blucon enter the code written on the side.
Position it correctly on your sensor. Some bridges have very little tolerance in respect with angle and distances to the sensor.
External Add-on
If your sensor requires an out of process algorithm, make sure it is installed now.
Continue to Start Sensor
Stop Libre sensor⌁
xDrip+ cannot physically stop a Libre sensor, it will stop running by itself after 14 days and 12 hours and keep showing the last value.
Still, when changing sensor it is strongly recommended to inform xDrip+ of the change by stopping the sensor.
Stop Sensor
Confirm you really want to stop the sensor.
Stop Sensor
Only stop your sensor when you actually plan to remove it, otherwise leave it running!
STOP SENSOR
This will reset all calibrations and allow xDrip+ to start a new sensor.