You have to jailbreak your iOS device when buying or downloading some app programs for Bluetooth OBD2 devices. WI-FI version OBD2 scanner helps to improve the limitation of Bluetooth one.
1) Download Rev software program in iTune app store
2) Connect your WIFI OBD2 scan tool with vehicle
3) Choose your elm327 device in your iOS device in the Settings
4) Connect iOS device with WIFI network
5) Set the IP Address to Static. Configure the IP address to 192.168.0.123 and the Subnet Mask to 255.255.255.0.
6) Go back and exit settings. The scanner will prompt you to configure an IP as a “router”. Select No. Do not set IP as a router. Otherwise, the iPhone will join the internet via elm327 and all data will not come through after connected to vehicle.
7) Start the engine and the WIFI elm327 scan tool will be powered up through vehicle OBD port
8) Configure the connection to use a custom TCP connection with IP 192.168.0.10 and TCP Port 35000 in Rev APP.
9) Enjoys vehicle data information, for example: see more than 5 parameters using landscape, record the data and later export it to CSV, helps maximize driving habits while saving on fuel etc.