l2cap

I am working on developing BLE app using connection oriented channel . I am using nordic semiconductor nrf52 as a peripheral device and iPhone 6 as central manager. I have used predefined PSM value provided by Bluetooth SIG that is 0x0025. I am ble to connect to peripheral and open L2CAP channel successfully. I am getting below error : **[CoreBluetooth] WARNING: Unknown error: 436 2018-06-08 10:03:17.532709-0400 BluetoothTest[407:62057] [CoreBluetooth] **No known channel matching peer with psm 37**** Could please let me know how to proceed and what is meaning of error code 436 Below is my code

I am developing a BLE application on Nexus 4 using Android BLE API. I have a few questions/doubts: 1) Is there a way to set/override the connection or notification interval of BLE central device. I have found that for Android, the default connection interval is fixed to 7.5ms. Is there a way to change this connection/notification delay interval settings. Source : http://processors.wiki.ti.com/index.php/Bluetooth_SensorTag?DCMP=lprf-stdroid&HQS=lprf-stdroid-pr-wiki1#Supported_Android_devices 2) On connecting to the remote device, I am facing an issue of getting disconnection after random period