New feature: Network data counter
1. Show Internet connection status in status bar:
Orange: Bad latency
Green: Online without data traffic
Blue: Online with data traffic
Purple: Online with high data traffic (more than 512KB/second)
2. Use DNS query. No direct connection to Internet to minimize cost, low power consumption.
Keyword: network, internet, status, connection, connectivity, monitor, detector, Wi-Fi, mobile data, counter.