How to do phones connect peripherals like keyboard and mouse?

Explanation:
The issue how to connect the peripherals (keyboard/mouse) should pay attention to the following points.
1. If it connects the wired peripheral device, the mobile phone needs to support OTG function and the corresponding adapter.
2. If it connects the Bluetooth wireless device, the phone needs to support Bluetooth HID. Please refer to the product parameter table for the specific support.
3. If it connects the game pad peripherals, the software shall be adaptive. For example, "PPSSPP" software can directly identify the game pad.
4. No matter wired connection or wireless connection, the corresponding driver program cannot be installed on the mobile phone terminal, so some driver functions (macro programming, RGB light control)/professional key functions (such as some keyboards will have a button to directly control volume) cannot be used on the mobile phone.
5. The same as the computer, when using the mobile phone to connect to the keyboard, the input method, the some shortcuts are decided by the third-party software. For example, the Google pinyin input method allows to input only through pinyin)
Notes:
1. Due to adaptation, driver and other reasons, it cannot be guaranteed that all external keyboards, mice and other peripherals can be connected and used normally.Therefore, if some devices will be used after connection, it can be confirmed according to the above points. If it still cannot be used, there may be compatibility problems between mobile phones and peripherals. It is suggested to replace other devices and verify that the OTG function is abnormal.