aprs is a registered trademark bob bruninga, wb4apr copyright © 2004 – peter loveall ae5pl all...
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APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
APRS-IS
APRS and the Internet
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
APRS
• Tactical UI protocol
• Everyone sees everything within range
• Messaging capable
• AX.25 based
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Why the Internet?
• Desire to see more than local RF
• Utilize facilities available only on the Internet
• Low cost backbone between RF networks
• World-wide availability
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Current APRS-IS Design
CoreServers
IGates
Tier 2Servers
IGates
Clients
Clients
RF
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Core Servers
• first.aprs.net, second.aprs.net, third.aprs.net, fourth.aprs.net
• All packets pass through core
• Offer full feed ports and message-only ports
• Some offer filtered ports
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Tier 2 Servers
• aprs2.net
• Full feed ports
• Regional ports
• User-defined filter ports
• Specialty ports (CWOP and Satgate ports)
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Other Servers
• Normally provide “local” access
• Run independently (not as a group)
• Various levels of reliability and capabilities
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Where do I connect?
• http://www.aprs-is.net/aprsservers.htm
• Servers connect to first through fourth.aprs.net port 23 or 10152
• IGates should, at a minimum connect to reduced feed ports on the core or tier 2 servers.
• Clients should connect to tier 2 server filtered feeds.
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
javAPRSFilter
• Server adjunct to javAPRSSrvr
• Any connection to reduced-feed ports can invoke filters
• Server can have predefined filters on ports
• Filters are additive
• With a browser, go to http://serverIPaddress:14501 for port availablility
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
fourth.aprs.net
• Core server in College Station, TX
• Supports all core ports
– 23, 10152 – Full Feed
– 1314 – Message-only
– 145802 – IGate Port
• Supports specialty ports
1– javAPRSSrvr only
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
IGates
• Pass all packets heard on RF to an Internet server (certain limitations)
• Pass messages addressed to local RF stations from APRS-IS (certain limitations)
• Pass sysop designated packets from APRS-IS to RF
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Why Gate?
• APRS on same 2 meter frequency nationwide
• 1200 bps, about 400 bps effective throughput
• APRS-IS currently about 10,000 bps
• APRS is tactical (local area)
• IGates provide world-wide connectivity
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Should I IGate?
• Bidirectional vs. Unidirectional
• Unidirectional – Anyone with Internet access
• Bidirectional – Areas not covered by other IGates
• DFW has 3 24/7 IGates plus 3 more part-time
• Duplicate coverage causes collisions & congestion
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Extra Internet Features
• World-wide messaging
• Callsign Lookup
• Web page tracking
• Tracking overlaying NWS radar maps
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
World-Wide Messaging
IDC
• Message gated from RF to APRS-IS
• IGate has seen TOCALL recently
• IGate gates message to RF
• Ad infinitum
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
• Message to EMAIL or an APRS+SA IGate
• EMAIL format:
– [email protected] message text
• APRS+SA format:
– em:[email protected] message text
• Message must be short
• One-way (to Internet)
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Callsign Lookup
• Message to APRS+SA IGate
• Format:
– w:mycall
– l:mycall
• W(hois) provides 1 line response from QRZ
• L(ocation) provides 3 line response from QRZ
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Internet Capable Clients
• APRS+SA
• APRSPoint
• javAPRS
• MacAPRS/WinAPRS/X-APRS
• UI-View
• Xastir
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
javAPRS
• ANY web site can be a LIVE APRS display
• Works with any browser supporting Java applets
• Supports server filtered feeds
• Supports Dosmaps and map images
• Free – http://javaprs.app.aprs-is.net
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Web Page Tracking
• www.findu.com
• www.jfindu.net
• www.aprsworld.net
• Other sites
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
NWS Radar Overlays
• Static Display – www.findu.com
• Real-time Display – www.jfindu.net
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
NWS Radar Display
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
q Construct
• http://www.aprs-is.net/q.htm
• Used for loop detection and other diagnostics
• Implemented in latest javAPRSSrvr and aprsd servers
• Construct for Internet only, not RF
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Interesting Facts on APRS-IS
• Over 2700 validated servers, clients, and IGates
• Over 2000 non-validated clients
• Over 20,000 RF stations
• Over 900 CWOP weather stations
• Over 14,000 Objects and Items
(Data from 10 day period during May 2004)
APRS is a registered trademark Bob Bruninga, WB4APRCopyright © 2004 – Peter Loveall AE5PL
All Rights Reserved
Q&A
• www.aprs-is.net
• Peter Loveall [email protected]