HC-05 to low cost AB shutter 3 I'm trying to connect a HC-05 to AB Shutter3 module. However, when I try to search AB Shutter3 address via AT commands (AT+INQ) I could not find AB Shutter3. 

I want to integrate both, so that I can send commands from an AB Shutter button click to HC-05. 

I also want to know whether the HC-05 needs to be in master or in slave mode.
I rather suspect the AB Shutter 3 is a Bluetooth HID device (like a keyboard or a mouse). The HC-05 can only communicate with Bluetooth Serial devices, such as the HC-06 or systems that can emulate a serial device (such as a computer or a smartphone).

You won't get them to communicate no matter how hard you hit them.