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I want to know what are platform drivers? What is the use of platform drivers?
I want to study about platform drivers, What is the starting point for study?
Platform drivers follow the standard driver model convention, where
discovery/enumeration is handled outside the drivers, and drivers
provide probe() and remove() methods. They support power management
and shutdown notifications using the standard conventions.
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As far as I know, ESP32 is capable of BLE communication.
Mostly done with Arduino, but I'm interested:
Is there a way to attach ESP32 to Linux, and use the standard BlueZ commands (hcitool, gatttool) for managing BLE peripherals?
hcitool and gatttool are part of the eight tools that have been depreacted by BlueZ
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=b1eb2c4cd057624312e0412f6c4be000f7fc3617
Zephyr is a small real-time operating system for connected, resource-constrained and embedded devices and I believe ESP32 is one of the support microcontrollers.
In Zephyr's documentation there is a section Using BlueZ with Zephyr which features a list of the supported tools that have replaced the ones you mention.
https://docs.zephyrproject.org/latest/guides/bluetooth/bluetooth-tools.html?highlight=bluez#using-bluez-with-zephyr
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I am trying to develop a chat application for Android which can create piconet / scatternet networks and will be able communicate with everyone in that network. But what i do not know is which routing protocol I should use for it. Thanks for ideas.
There have been several protocols tried out over the years. Try AODV for android.
https://www.researchgate.net/publication/220308162_An_approach_to_use_FB-AODV_with_Android
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How to write and load GUI in linux using qt or some other framework ?
any kernel api is available for that ?
There is no kernel api for qt or any other GUI toolkit on Linux. GUI toolkits are not a part of kernel.
For qt, please reference to http://qt-project.org/doc/
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I would love to upload my arduino sketches via bluetooth, but I have no idea where to start. This is part of a bigger project I am working on.
Yes and it is fairly easy to do. see this post.
Here's a detailed how-to I wrote that includes instructions for Windows and a slightly more simple circuit for using the HC-05 with it's common breakout board (highly recommend getting the module on the breakout): ​http://makezine.com/projects/diy-arduino-bluetooth-programming-shield/
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I know j2me , Android for creating mobile phone applications. What are the other languages ?
Just about anything. There's frameworks and SDKs for Javascript (Phonegap, NimbleKit, Unity 3D), Flash, Lua, C/C++, and Objective-C (of course). There's many more projects to bring other languages to mobile platforms.