helptext=>Configures provisioning on this gateway.
usage=>Mode = [off|once|always],Url = [provisioning_url],PollingInterval = [interval_in_min - empty for none]
example=>&Mode=once&Url=http://192.168.99.1/provisioning/beronet_gateway/config-update.conf?mac={MAC}&PollingInterval=360
return=>success -> if everything was ok.,error -> if an error occured.
