include the status of the nexusedge service in the gateway heartbeat.…

… increase freq of heartbeat to every min.

scripts/send-ne-status.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# this script sends the status of the "nexusedge" service running on the gateway to an mqtt topic every minute
+
+filename="/etc/gateway-id"
+if [ -s "$filename" ]
+then
+   id=$(cat /etc/gateway-id)
+else
+   id=$(cat /sys/class/net/wlan0/address | sed 's/://g')
+fi
+
+while sleep 60
+do
+  # get the status of the nexusedge service. the command returns "active" or "inactive"
+  ne_status=$(systemctl is-active nexusedge)
+
+  gateway_ip=$(hostname -I|cut -d" " -f1)
+
+  # get current timestamp from nodejs as an iso8601 string
+  timestamp=$(/usr/bin/node -e "console.log(new Date().toISOString())")
+
+  # generate a json with the shell variables. -c suppresses newlines.
+  message_json=$( jq -c -n \
+                    --arg device "nexusedge-gateway" \
+                    --arg gateway_ip "$gateway_ip" \
+                    --arg ne_status "$ne_status" \
+                    --arg received_time "$timestamp" \
+                    --arg device_id "$id"\
+                    '{device: $device, gateway_ip: $gateway_ip, status: $ne_status, _meta: {received_time: $received_time, device_id: $device_id}}' )
+
+  # publish data to the linklab influxdb mqtt topic
+  mosquitto_pub -t gateway-data -m "$message_json"
+done

scripts/systemd/nexusedge-heartbeat.service

@@ -1,12 +1,12 @@
 [Unit]
-Description=Send a heartbeat every 5 minutes from a NexusEdge gateway
+Description=Send a heartbeat every minute from a NexusEdge gateway
 After=linklab-influxdb-publisher.service
 Wants=linklab-influxdb-publisher.service
 
 [Service]
 # just wait until the linklab mqtt publisher is setup and functioning
 ExecStartPre=/bin/sh -c 'sleep 5'
-ExecStart=/usr/bin/node /root/on-the-edge/platform/utils/send-heartbeat.js
+ExecStart=/root/on-the-edge/scripts/send-ne-status.sh
 Restart=always
 StandardOutput=syslog
 StandardError=syslog