Doodle Labs Smart Radio Handleiding voor probleemoplossing - Pagina 14

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Smart Radio Trouble-Shooting

Guide

also be setup with a static IP address. Many of such devices can be on the same subnet.

USB Recerse Tethering may be supported on Android tablets as they do not have a

dedicated internet connection. This mode works with the Smart Radio's USB Device port

(Wearable, Hex-Band).

Signal Integrity and Power

USB lines run at high speed and are very sensitive to both differential and common-mode

disturbances. Make sure that all four lines (VBUS, USB+, USB-, GND) are tightly twisted

together. Ideally the lines should be kept short for best signal integrity.

Some Smart Radio models supply a 5-V output with the USB. This output is rated to a maximum

of 1-A. If the connected device is power hungry, then you should supply the power externally.

Debugging

You can check the connectivity of the USB port if you

the USB Host port, unplug and then plug in the USB device, and then run

root@smartradio:/# dmesg | tail

This prints out the latest kernel messages and you should see some notifications about activity

on the USB port. You can also type

bridged to the network.

If you are using the USB Device port, you should check for connectivity information on the host

machine itself rather than the Smart Radio (for example, notifications that a new USB device

was attached). From the Smart Radio, you can attempt to directly ping the host machine, and

should resolve and IP conflicts (see

Crashes, Reboots, etc

The Smart Radios are designed to take a beating. That said, no system is perfect and if you find

that the radios are misbehaving, consider the points below.

Unexpected wireless down time

If the Smart Radio is under heavy network load for hours or days on end, the watchdog monitor

may kick in if the radio's transmit queues get stuck. This will result in around 30 seconds of

down time.

Reboots and crashes

The Smart Radio is not expected to reboot. If it does, first check that your power supply is

sufficient, and that the radio is not overheating. If you are able to save the state of the system

SSH

to make sure that the USB port is up and

ifconfig usb0

Trouble-Shooting Radio Access

Page 14

into the Smart Radio. If you are using

section of this guide).

September 8, 2021