Hack for changing connection interval on bluez peripheral !!

In BlueZ  – to enforce a Connection Interval edit a file that is located in  /var/lib/bluetooth/[ADAPTER]/[DEVICE]/info  where [ADAPTER] and [DEVICE] is the bluetooth adapter address and device address bluez is connected to respectively and  and restart bluetoothd. Add the following lines:

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[ConnectionParameters] MinInterval=8 MaxInterval=16 Latency=0 Timeout=200

[ConnectionParameters] MinInterval=6 MaxInterval=12 Latency=0 Timeout=200

Tune MinInterval and MaxInterval as per your  peripheral needs.