direwolf(1)

Soundcard TNC for packet radio.

Section 1 direwolf bookworm source

Description

DIREWOLF

NAME

direwolf - Soundcard TNC for packet radio.

SYNOPSIS

direwolf [ options ] [ - | udp:9999 ]

The first audio channel can be streamed thru stdin or a UDP port. This is typically used with an SDR receiver.

DESCRIPTION

direwolf is a software "soundcard" modem/TNC and APRS encoder/decoder. It can be used stand-alone to receive APRS messages, as a digipeater, APRStt gateway, or Internet Gateway (IGate). It can also be used as a virtual TNC for other applications such as APRSIS32, UI-View32, Xastir, APRS-TW, YAAC, UISS, Linux AX25, SARTrack, RMS Express, and many others.

OPTIONS

-c file

Read configuration file from specified location rather than the default locations.

-l logdir

Generate daily log files in specified directory. Use "." for current directory.

-L logfile

Generate single log file with fixed name.

	-r n		Audio sample rate per second for first channel. Default 44100.
	-n n		Number of audio channels for first device. 1 or 2. Default 1.
	-b n		Audio sample size for first channel. 8 or 16. Default 16.
	-B n		Data rate in bits/sec for first channel. Standard values are 300, 1200, 2400, 4800, 9600.

300 bps defaults to AFSK tones of 1600 & 1800.
1200 bps uses AFSK tones of 1200 & 2200.
2400 bps uses QPSK based on V.26 standard.
4800 bps uses 8PSK based on V.27 standard.
9600 bps and up uses K9NG/G3RUH standard.
AIS for ship Automatic Identification System.
EAS for Emergency Alert System (EAS) Specific Area Message Encoding (SAME).

	-g		Force G3RUH modem regardless of data rate.
	-j		2400 bps QPSK compatible with Dire Wolf <= 1.5.
	-J		2400 bps QPSK compatible with MFJ-2400.
	-D n		Divide audio sample by n for first channel.
	-X n		1 to enable FX.25 transmit.
	-d x		Debug options. Specify one or more of the following in place of x.

a = AGWPE network protocol client.
k = KISS serial port client.
n = Network KISS client.
u = Display non-ASCII text in hexadecimal.
p = Packet dump in hexadecimal.
g = GPS interface.
W = Waypoints for position or object reports.
t = Tracker beacon.
o = Output controls such as PTT and DCD.
i = IGate
h = Hamlib verbose level. Repeat for more.
m = Monitor heard station list.
f = Packet filtering.
x = FX.25 increase verbose level.

-q x

Quiet (suppress output). Specify one or more of the following in place of x.

h = Heard line with the audio level.
d = Decoding of APRS packets.

	-t n		Text colors. 0=disabled. 1=default. 2,3,4,... alternatives. Use 9 to test compatibility with your terminal.
	-p		Enable pseudo terminal for KISS protocol.
	-x		Send Xmit level calibration tones.
	-U		Print UTF-8 test string and exit.
	-S		Print Symbol tables and exit.
	-a n		Report audio device statistics each n seconds.

-T fmt

Time stamp format for sent and received frames.

-e ber

Receive Bit Error Rate (BER), e.g. 1e-5

EXAMPLES

gqrx (2.3 and later) has the ability to send streaming audio through a UDP socket to another application for further processing. direwolf can listen over a UDP port with options like this:

direwolf -n 1 -r 48000 -b 16 udp:7355

Other SDR applications might produce audio on stdout so it is convenient to pipe into the next application. In this example, the final "-" means read from stdin.

rtl_fm -f 144.39M -o 4 - | direwolf -n 1 -r 24000 -b 16 -