Add the photos role

roles/photos/templates/photo-gallery.service

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+# Managed by Ansible
+
+[Unit]
+Description=Gallery service
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/node /opt/photo-gallery/server.js
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target

roles/photos/templates/photos2mqtt.pl

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+#!/usr/bin/perl -w
+
+# Managed by Ansible
+
+use strict;
+use Net::MQTT::Simple;
+use Linux::Inotify2;
+use POSIX qw(strftime);
+use Time::HiRes qw(sleep time);
+
+my $path = "{{ photos_path }}";
+my $mqtt = Net::MQTT::Simple->new('{{ photos_mqtt_host }}');
+
+my $inotify = new Linux::Inotify2 or die $!;
+$inotify->blocking(0);
+
+sub today {
+    return strftime "%Y%m%d", localtime;
+}
+
+sub watch_daydir {
+    my ($dn) = @_;
+
+    print "Watching $dn\n";
+
+    $inotify->watch($dn, IN_CREATE, sub {
+        my $event = shift;
+        $inotify->watch($event->fullname, IN_CLOSE_WRITE, sub {
+            my $event = shift;
+            my $fn = $event->fullname;
+            unless ($fn =~ m[^\.|/\.]) {  # skip hidden files
+                print "New file written: $fn\n";
+                $mqtt->retain("{{ photos_mqtt_topic }}", $fn =~ s[^$path/][]r);
+            }
+            $event->w->cancel;
+        });
+    });
+}
+
+print "Watching $path\n";
+$inotify->watch($path, IN_CREATE, sub {
+    my $event = shift;
+    my $dn = $event->fullname;
+    -d $dn or next;
+
+    watch_daydir($dn);
+});
+
+watch_daydir("$path/" . today());
+
+while (1) {
+    $mqtt->tick(.05);
+    $inotify->poll;
+    sleep .1;
+}

roles/photos/templates/photos2mqtt.service

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+# Managed by Ansible
+
+[Unit]
+Description=Photos to MQTT
+After=network.target
+
+[Service]
+Type=simple
+Restart=on-failure
+RestartSec=10s
+ExecStart=/usr/bin/perl /opt/photos2mqtt.pl
+User=wip
+
+[Install]
+WantedBy=multi-user.target
+