Any help or info from this problem; or any other customer has same problem?
If device is BLE 4.0, but android phone BLE version is below ver4.0 or it android version is old,
will it get this problem
I try to adjust connection speed with lel2cap_sendConnParamUpdateReq() but it seems failure.
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Per Android developer website, Android supports BLE after 4.3
Android 4.3 (API Level 18) introduces built-in platform support for Bluetooth Low Energy in the central role and provides APIs that apps can use to discover devices, query for services, and read/write characteristics. In contrast to Classic Bluetooth, Bluetooth Low Energy (BLE) is designed to provide significantly lower power consumption. This allows Android apps to communicate with BLE devices that have low power requirements, such as proximity sensors, heart rate monitors, fitness devices, and so on.
What's the minInterval/maxInterval you use for lel2cap_sendConnParamUpdateReq()? Basically use 6 you can get most fast speed.