GPSD fails to connect to STR2STR

[deece]

Describe the bug
GPSD fails to connect:

Sep 07 20:15:03 rtkgps gpsd[1290]: gpsd:WARN: PACKET: packet_get1(fd 8) errno: Connection refused(111)
Sep 07 20:15:03 rtkgps gpsd[1290]: gpsd:WARN: CORE: device read of tcp://localhost:5015 returned error or packet sniffer failed sync (flags {ERROR})

To Reproduce
Steps to reproduce the behavior:
Enable '-D 2' in the GPSD_OPTIONS of /etc/default/gpsd
Restart gpsd
journalctl -f -u gpsd

Expected behavior
GPSD connects to the cloned GPS unit

Software/Hardware (please complete the following information):

• RTKBase release number 2.6.1
• OS: Raspberry Pi OS Lite, Debian GNU/Linux 12 (bookworm)
• SBC Raspberry Pi 4
• GNSS Device: Quectel LC29HBS
• Connection type: serial

Additional context
Replacing 'localhost' in /etc/defaults/gpsd with '127.0.0.1' fixes the problem.

Local resolution appears to be working:

root@rtkgps:~# nslookup localhost
Server:		10.0.1.1
Address:	10.0.1.1#53

Name:	localhost.lan
Address: 127.0.0.1
Name:	localhost.lan
Address: ::1

It could be because str2str is only bound to the ipv4 address, and not ipv6 too:

root@rtkgps:~# netstat -lp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
<snip>
tcp        0      0 0.0.0.0:5015            0.0.0.0:*               LISTEN      676/str2str
<snip>

[Stefal]

Hi!

I don't understand why it doesn't work with localhost.
Is 127.0.0.1 localhost in your /etc/hosts file?

[deece]

@Stefal newer distros resolve to both IPV6 and IPV4:

deece@rtkgps:~ $ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

deece@rtkgps:~ $ host localhost
localhost.lan has address 127.0.0.1
localhost.lan has IPv6 address ::1

deece@rtkgps:~ $ cat /etc/hosts
127.0.0.1	localhost
::1		localhost ip6-localhost ip6-loopback
ff02::1		ip6-allnodes
ff02::2		ip6-allrouters

127.0.1.1	rtkgps