Chapter 3
Operation
3.1.7 Sleep Mode (Power Saving) and Automatic Wake Up
The NTWB1 will enter sleep mode to save power if no NMEA data has
been received for 60 seconds. It will automatically wake up every 5
minutes or whenever NMEA data is being received.
The NTWB1 will stay awake whenever NMEA data is being received
periodically with no more than 60 seconds between datagrams.
While in sleep mode, all lights remain off, the WiFi radio is turned off and
only a small amount of power will be consumed. Because the WiFi radio is
off the 'Madman xxxx' SSID will not be found.
To wake the NTWB1 from sleep mode do one of the following:
• Send NMEA data to it (via the wired NMEA connection)
• Wait 5 minutes at which time it will automatically wake up
• Cycle the power to it.
3.1.8 About UDP and TCP – Which Do I Choose?
Very basically, TCP is a reliable protocol in that the data is guaranteed to
be received due to two-way handshaking between sender and receiver
whereas UDP is unreliable in that the sender has no way to know whether
the UDP data was received (and doesn't care either). For displaying
marine instrument data for information only, UDP is more than suitable as
the data is regularly updated so if some UDP data is not received at one
moment it is quickly replaced by new data soon after.
The NTWB1 can only make one TCP connection at a time but can make up
to seven UDP connections, so select TCP if you are using only one device
and UDP if you need to connect several devices.
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