routeros: Add script to publish poe power to mqtt

roles/routeros/files/routeros-poe-mqtt-publish.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+
+set -eu
+umask 077
+
+community="public"
+
+mqtt_send() {
+    topic="$1"
+    value="$2"
+
+    tlsdir="$(openssl version -d | sed -e 's/^OPENSSLDIR: "\(.\+\)"$/\1/')"
+    mosquitto_pub -h mqtt02.home.foo.sh -t "$topic" -m "$value" \
+        --cafile "${tlsdir}/certs/ca.crt" \
+        --key "${tlsdir}/private/$(hostname -f).key" \
+        --cert "${tlsdir}/certs/$(hostname -f).crt"
+}
+
+snmp_get() {
+    host="$1"
+    key="$2"
+    snmpget -v 1 -c "$community" "$host" -Oqv -m MIKROTIK-MIB "$key" | tr -d '"'
+}
+
+# only run script if first vrrp interface is in master state
+for state in /run/keepalived/*.state ; do
+    if [ "$(cat "$state")" != "MASTER" ]; then
+        exit 0
+    fi
+    break
+done
+
+ldapsearch -Q -LLL "(&(objectClass=device)(description=MikroTik *))" cn | \
+    awk '{ if ($1 == "cn:") print $2 }' | while read -r name
+do
+    snmpwalk -v 1 -c "$community" "$name" -Oq -m MIKROTIK-MIB \
+        MIKROTIK-MIB::mtxrPOEStatus | while read -r port status
+    do
+        port="$(echo "$port" | cut -d "." -f 2)"
+        [ "$status" = "poweredOn" ] || continue
+
+        device="$(snmp_get "$name" "SNMPv2-SMI::mib-2.31.1.1.1.18.${port}")"
+        [ -z "$device" ] && continue
+        location="$(ldapsearch -Q -LLL "(&(objectClass=device)(cn=${device}))" l | \
+            sed -n 's/^l: \(.\+\)/\1/p' | tr '[:upper:]' '[:lower:]' | tr ' ' '_')"
+        [ -z "$location" ] && continue
+
+        for key in Current Power Voltage ; do
+            topic="home/${location}/${device}/$(echo "$key" | tr '[:upper:]' '[:lower:]')"
+            value="$(snmp_get "$name" "MIKROTIK-MIB::mtxrPOE${key}.${port}")"
+            mqtt_send "$topic" "$value"
+        done
+    done
+done