You require an OTG cable for smartphone (1) or tablet (2), a USB to RS232 cable (3). To establish connection with router (5) another cable is required like CISCO DB9 to RJ45 cable (4) or other if required. Connection also can be established with computer (6) or microcontroller board (7) such as Arduino board through USB ports or TTL ports, possibly containing wireless built-in modules as well. Different types of modules can be used such as USB/TTL converter (8) and USB/Serial converter (9), TTL Bluetooth module (10) and serial Bluetooth module (11), TTL Wi-Fi module (12) and serial Wi-Fi module (13) and etc.
