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On my Pi3B+ I had pigpiod configured to run on boot and I can successfully run compiled c programs; specifically DHTXXD.c which contains:-

/*
DHTXXD.c
2016-02-16
Public Domain
*/

#include <stdio.h>
#include <stdlib.h>

#include <pigpiod_if2.h>

However when I try to run pigs hwver I get an error "socket connect failed" even though systemctl status pigpiod shows it is running and port 8888 is open.

Indeed any pigs command failed.

I disabled and reenabled pigpiod with sudo systemctl enable pigpiod which responded:-

Created symlink /etc/systemd/system/multi-user.target.wants/pigpiod.service → /lib/systemd/system/pigpiod.service.

When I disable pigpiod on boot then DHTXXD fails.

If I manually enable with sudo pigpiod then both work.

With pigpiod manually started

$ sudo systemctl status pigpiod
● pigpiod.service - Daemon required to control GPIO pins via pigpio
   Loaded: loaded (/lib/systemd/system/pigpiod.service; disabled; vendor preset: enabled)
   Active: inactive (dead)

With pigpiod automatically started

$ sudo systemctl status pigpiod
● pigpiod.service - Daemon required to control GPIO pins via pigpio
   Loaded: loaded (/lib/systemd/system/pigpiod.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-12-13 12:18:39 AEDT; 35s ago
  Process: 347 ExecStart=/usr/bin/pigpiod -l (code=exited, status=0/SUCCESS)
 Main PID: 371 (pigpiod)
   CGroup: /system.slice/pigpiod.service
           └─371 /usr/bin/pigpiod -l

Anyone have any idea to make reliable autostart?

  • Sorry if this sounds flippant but it does look as though it has something to do with the systemd setup - I use the older (non-standard these days) sysV init to run my own daemon from that setup's /erc/rc.local that spawns a separate pigpiod thread - and from what I recall of @joan 's pigpio library it used to (I am not sure that it used the same mechanism nowadays) check that there is only one instance running by looking for a /run/pigpiod.pid file - but if it crashed previously that file might still be around and be preventing a new instance from starting... – SlySven Dec 14 '18 at 3:17

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