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OWTAP(1) One-Wire File System OWTAP(1) NAME owtap - Packet sniffer for the owserver protocol SYNOPSIS owtap -p owtap-tcp-port -s owserver-tcp-port DESCRIPTION 1-Wire 1-wire is a wiring protocol and series of devices designed and manufac- tured by Dallas Semiconductor, Inc. The bus is a low-power low-speed low-connector scheme where the data line can also provide power. Each device is uniquely and unalterably numbered during manufacture. There are a wide variety of devices, including memory, sensors (humid- ity, temperature, voltage, contact, current), switches, timers and data loggers. More complex devices (like thermocouple sensors) can be built with these basic devices. There are also 1-wire devices that have en- cryption included. The 1-wire scheme uses a single bus master and multiple slaves on the same wire. The bus master initiates all communication. The slaves can be individually discovered and addressed using their unique ID. Bus masters come in a variety of configurations including serial, par- allel, i2c, network or USB adapters. OWFS design OWFS is a suite of programs that designed to make the 1-wire bus and its devices easily accessible. The underlying principle is to create a virtual filesystem, with the unique ID being the directory, and the in- dividual properties of the device are represented as simple files that can be read and written. Details of the individual slave or master design are hidden behind a consistent interface. The goal is to provide an easy set of tools for a software designer to create monitoring or control applications. There are some performance enhancements in the implementation, including data caching, parallel access to bus masters, and aggregation of device com- munication. Still the fundamental goal has been ease of use, flexibil- ity and correctness rather than speed. owserver owserver (1) is the backend component of the OWFS 1-wire bus control system. owserver (1) arbitrates access to the bus from multiple client processes. The physical bus is usually connected to a serial or USB port, and other processes connect to owserver (1) over network sockets (tcp port). Frontend clients include a filesystem representation: owfs (1) , and a webserver: owhttpd (1). Direct language bindings are also available, e.g: owperl (3). There are also many light-weight clients that can only talk to owserver (1) and not to the 1-Wire bus directly. They include shell and multiple language modules (perl, Visual Basic, python,...) owserver protocol All the owserver (1) clients use the owserver protocol for communica- tion. The owserver protocol is a well documented tcp/ip client/server protocol. Assigned the "well known port" default of 4304. owtap owtap (1) is interposed between owserver (1) and clients, to display and help resolve communication problems. Network communication is for- warded in both directions, but a visual display is also created, with statistics and "drill-down" of individual packets. SPECIFIC OPTIONS -p TCP port or IPaddress:port for owtap Other OWFS programs will access owtap via this address. (e.g. owdir -s IP:port /) -s TCP port or IPaddress:port for owserver The tcp port (IP:port) for the "upstream" owserver. EXAMPLE If owserver (1) is started: owserver -p 4304 -d /dev/ttyS0 owserver on tcp port 4304 and connects to a physical 1-wire bus on a serial port. You can directly query owserver (1) with owdir -s 4304 / To see the protocol in action: owtap -s 4304 -p 3000 owdir -p 3000 / In this case owtap (1) is connecting to owserver (1) on the original port (4304) and offering a new port (3000) for clients. PLATFOMS owtap (1) is a pure Tcl/TK program and will run wherever Tcl/TK is available (Windows, Macintosh, Linux, Unix) LINKS owserver protocol http://www.owfs.org/index.php?page=owserver-protocol Tcl/TK http://www.tcl.tk SEE ALSO Programs owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1) owwrite (1) owpresent (1) owtap (1) Configuration and testing owfs (5) owtap (1) owmon (1) Language bindings owtcl (3) owperl (3) owcapi (3) Clocks DS1427 (3) DS1904(3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3) ID DS2401 (3) DS2411 (3) DS1990A (3) Memory DS1982 (3) DS1985 (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3) DS1995 (3) DS1996 (3) DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3) DS2506 (3) DS28E04 (3) DS28EC20 (3) Switches DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3) Temperature DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) Humidity DS1922 (3) Voltage DS2450 (3) Resistance DS2890 (3) Multifunction (current, voltage, temperature) DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3) DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3) Counter DS2423 (3) LCD Screen LCD (3) DS2408 (3) Crypto DS1977 (3) Pressure DS2406 (3) -- TAI8570 AVAILABILITY http://www.owfs.org AUTHOR Paul Alfille (paul.alfille@gmail.com) OWTAP Manpage 2007 OWTAP(1)
NAME | SYNOPSIS | DESCRIPTION | SPECIFIC OPTIONS | EXAMPLE | PLATFOMS | LINKS | SEE ALSO | AVAILABILITY | AUTHOR
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