PurpleAir sensors will only communicate with the following fully qualified domain (FQDN) hostnames:
http://www.purpleair.comhttp://api.purpleair.comupdate.purpleair.comsensors-ingest.wunderground.compool.ntp.orgwww.googleapis.com
Outgoing ports used by PurpleAir sensors:
HTTP: 80HTTPS: 443DNS: 53NTP: 123
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Sensor WiFi and Registration
WiFi Troubleshooting
WiFi Status Indicators