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Follow the code and PCB.
So you find its wrong. Correct it then.
use the same port number if you are using other 8051 microcontroller.
AT89c2051 is also an 8051 microcontroller, so you can use any 8051 microcontroller.
Check the connections in between the mcu and display. Also the pin 5 of lcd should be connected to ground.
yes you can use any Bluetooth to serial module.
Yes you can program it.
Are you configuring the module as server or client?
if it is server , then it will send that data to all its clients which are connected to it.
Yes the only way is to reset the module.
Program is there already on the projects page.
Then you need to change the code for it.
i haven't add cortana with this app, but will add it soon.
Separate names with a comma.