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, WB4APR Copyright © 2004 – Peter Loveall AE5PL All Rights Reserved APRS-IS APRS and the Internet

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Page 1: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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-IS

APRS and the Internet

Page 2: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Page 3: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 4: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Current APRS-IS Design

CoreServers

IGates

Tier 2Servers

IGates

Clients

Clients

RF

Page 5: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 6: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Tier 2 Servers

• aprs2.net

• Full feed ports

• Regional ports

• User-defined filter ports

• Specialty ports (CWOP and Satgate ports)

Page 7: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Other Servers

• Normally provide “local” access

• Run independently (not as a group)

• Various levels of reliability and capabilities

Page 8: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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.

Page 9: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 10: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 11: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 12: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 13: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 14: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Extra Internet Features

• World-wide messaging

• Email

• Callsign Lookup

• Web page tracking

• Tracking overlaying NWS radar maps

Page 15: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

World-Wide Messaging

IDC

• Message gated from RF to APRS-IS

• IGate has seen TOCALL recently

• IGate gates message to RF

• Ad infinitum

Page 16: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Email

• 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)

Page 17: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 18: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Internet Capable Clients

• APRS+SA

• APRSPoint

• javAPRS

• MacAPRS/WinAPRS/X-APRS

• UI-View

• Xastir

Page 19: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 20: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Web Page Tracking

• www.findu.com

• www.jfindu.net

• www.aprsworld.net

• Other sites

Page 21: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

NWS Radar Overlays

• Static Display – www.findu.com

• Real-time Display – www.jfindu.net

Page 22: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

NWS Radar Display

Page 23: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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

Page 24: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

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)

Page 25: APRS is a registered trademark Bob Bruninga, WB4APR Copyright © 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

Q&A

• www.aprs-is.net

• Peter Loveall [email protected]