IOT Image not providing IP address to Linux USB

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Steven Hirsch

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Jul 20, 2021, 6:45:48 PM7/20/21
to BeagleBone
System is:

Linux beaglebone 4.14.108-ti-r119 #1 SMP PREEMPT Mon Sep 30 02:30:24 UTC 2019 armv7l GNU/Linux

BeagleBoard.org Debian Image 2019-10-01

When connecting to USB on a Linux desktop system, the host creates the interfaces for USB0 and USB1 but DHCP times out trying to get IP address from the BB.  Networking functions if I assign it manually.

After logging into the BB, I find that the dhcp server is not running:

● dnsmasq.service                                                                                            loaded failed failed    dnsmasq - A lightweig
ht DHCP and caching DNS server                                                  
 udhcpd.service                                                                                             loaded active exited    LSB: Start busybox ud
hcpd at boot time

This image has not been modified or configured in any manner.  Shouldn't it be providing an address to the host?

Robert Nelson

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Jul 21, 2021, 9:56:48 AM7/21/21
to Steven Hirsch, BeagleBone
It looks like your image is using udhcpd, which can only handle one
interface, which is why we switched to dnsmasq.. Considering you have
usb0/usb1, it needs to use dnsmasq.

Regards,

--
Robert Nelson
https://rcn-ee.com/

Steven Hirsch

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Jul 21, 2021, 10:39:43 AM7/21/21
to BeagleBone
After considerable digging and hair pulling, the issue seems to have been caused by a bug in the dnsmasq scripting.  The /etc/default/bb-boot file was empty, resulting in a corrupted /etc/dnsmasq.d/SoftAp0 file.  As a result dnsmasq was not starting.  Worse, the source for that /etc/default/bb-boot (/opt/scripts/boot/default/bb-boot) was ALSO empty and git indicates that was current (!).  I finally found a post where you apparently fixed the issue.  Problem is that updating the dnsmasq package fixes the script, but does nothing to mitigate the empty configuration file.  Once I got the entire picture, I extracted a proper bb-boot file, copied it in and all is well.   Sorry for the confusing cut and paste, but the systctl output shows that the service failed to start.  I don't know what udhcpd.service is doing in this mix, but I didn't configure it and it shows as exited.  I assumed it was something transient during the boot process (?).
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