NAME

net-mqtt-trace - Perl script for decoding MQTT messages from IP packets

VERSION

version 1.123440

SYNOPSIS

net-mqtt-trace [options] {dev|dumpfile}

# live decode
# decode MQTT packets that are visible on the interface eth0
net-mqtt-trace eth0

# batch decode
# sniff 100 MQTT packets from eth0 and write them to mqtt.tcp
# then later decode MQTT messages from tcpdump file
tcpdump -w mqtt.tcp -i eth0 -c 100 -s 4096 tcp and port 1883
net-mqtt-trace mqtt.tcp

DESCRIPTION

This script is an MQTT message decoder for IP packets. Packets can be decoded live by sniffing traffic on a network interface or they can be batched processed by reading them from a tcpdump file.

OPTIONS

-help

Print a brief help message.

-man

Print the manual page.

-verbose

Include more verbose output. By default, the start and end of processing produce a little output. This option turns on further output including a summary of the counts of different packets decoded.

-quiet

Remove even the basic verbose output.

-link

Print link layer - assumed to be Ethernet - information. This option may be repeated to get further output.

-ip

Print ip layer information. This option may be repeated to get further output.

-tcp

Print TCP layer information. This option may be repeated to get further output.

-mqtt

Print MQTT message information. This option may be repeated to get further output.

-count NNN

Stop processing after the given number of packets. The default is to process all packets.

-snaplen NNN

Maximum length of data to capture for each packet. Default is 65535. This is only used when capturing directly from a device.

-promisc

Turn on promiscuous mode. Default is off. This is only used when capturing directly from a device.

-timeout NNN

The read timeout in milliseconds. Default is 0 (no timeout). This is only used when capturing directly from a device.

SEE ALSO

Net::MQTT::Message(3), Net::Pcap(3), tcpdump(8)

AUTHOR

Mark Hindess <soft-cpan@temporalanomaly.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Mark Hindess.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.