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Smart Radio Trouble-Shooting

Guide

problem with the configuration. For example, the IP address, network port or

firewall could be configured wrongly.

USB Trouble-shooting

Different hardware variants have different types of USB ports. Please see the first section for

details. USB uses a master-slave communications protocol where a single host can support up

to 128 slaves. In general, a USB port is either a USB device or a USB host; USB devices cannot

communicate with other USB devices and USB hosts cannot communicate with other hosts.

Please check what type of USB port your hardware has before proceeding.

Some devices have USB OTG ports which can switch between host and device mode. Typically

they use the 5-V VBUS line as an indicator for which mode they should be in. If an OTG port

detects power on the VBUS line, then it will switch to device mode.

Smart Radio USB Device Ports

The USB Device port is the main data interface on the Wearable and Hex-Band models. It only

supports IP networking over USB and does not support any other USB protocol such as HID. This

port can be directly plugged into a laptop, or certain Smart Devices (typically tablets and not

phones). Please see the note on Android below.

Smart Radio USB Host Ports

The USB Host port is setup by default to support IP networking over USB. It can be made to

support certain USB devices, depending on the type of driver required. It cannot be connected

directly with a laptop, but it can be connected to certain Smart Devices (typically phones). See

the note on Android below.

Android

Android phones and tablets usually have USB OTG ports, and may support USB tethering or USB

reverse tethering.

• USB Tethering is when the Android device is sharing it's internet connection with

another device. The Android device's OTG port switches to device mode (it needs a 5-V

input to do so). The Android device also starts a DHCP server and routes traffic from the

connected device to it's internet connection. Only one such Android device can be on

the subnet. USB Tethering is normally supported on Android phones as they are

expected to have a dedicated internet connection. This mode works with the Smart

Radio's USB Host port.

• USB Reverse Tethering is when the Android device gets it's internet connection from

another device. The Android device's OTG port switches to host mode and it raises the

VBUS line to 5-V. The Android device switches to DHCP client mode by default, but it can

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September 8, 2021