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OWHTTPD(1) One-Wire File System OWHTTPD(1) NAME owhttpd - Tiny webserver for 1-wire control SYNOPSIS owhttpd [ -c config ] -d serialport | -u | -s [host:]port -p 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. owhttpd owhttpd (1) is a small webserver that shows the Dallas/Maxim 1-Wire bus attached to a serial port. The main view shows the devices found, You can then navigate to individual devices, and view/alter their proper- ties. owhttpd (1) uses the same naming convention as owfs (1) , where the URL corresponds to the filename. The web server is a modified version of chttpd by Greg Olszewski. It serves no files from the disk, only virtual files from the 1-wire bus. Security should therefore be good. Only the 1-wire bus is at risk. SPECIFIC OPTIONS -p portnum Sets the tcp port the web server runs on. Access with the URL http://servernameoripaddress:portnum If no port is specified, an ephemeral port is selected by the operating system. Use zeroconf (Bonjour) to discover the assigned port. Device Options (1-wire Bus Master) These options specify the device (bus master) connecting the computer to the 1-wire bus. The 1-wire slaves are connected to the 1-wire bus, and the bus master connects to a port on the computer and controls the 1-wire bus. The bus master is either an actual physical device, the kernel w1 module, or an owserver (1). At least one device option is required. There is no default. More than one device can be listed, and all will be used. (A logical union unless you explore the /bus.n/ directories.) Linux and BSD enforce a security policy restricting access to hardware ports. You must have sufficient rights to access the given port or ac- cess will silently fail. * Serial devices port specifies a serial port, e.g. /dev/ttyS0 or an USB port accessed as serial port, e.g. /dev/ttyUSB0 If OWFS was built with libftdi support, you may be able to use the ftdi: prefix in any of the options as port to address a FTDI-based USB device. For details, see the FTDI ADDRESSING section. -d port | --device=port (DS2480B) DS2480B-based bus master (like the DS9097U or an adapter of the LINK family in emulation mode). If the adapter doesn't respond, a passive type (DS9907E or diode/resistor) circuit will be as- sumed. --serial_flextime | --serial_regulartime (DS2480B) Changes details of bus timing (see DS2480B datasheet). Some de- vices, like the Swart LCD cannot work with flextime. --baud=1200|9600|19200|38400|57600|115200 (DS2480B,LINK,HA5) Sets the initial serial port communication speed for all bus masters. Not all serial devices support all speeds. You can change the individual bus master speed for a device of the LINK family and DS2880B in the interface/settings directory. The HA5 speed is set in hardware, so the command line baud rate should match that rate. Usually the default settings (9600 for a device of the LINK fam- ily and DS2480B ) and 115200 for the HA5 are sane and shouldn't be changed. --straight_polarity | --reverse_polarity (DS2480B) Reverse polarity of the DS2480B output transistors? Not needed for the DS9097U, but required for some other designs. --link=port (LINK) iButtonLink LINK adapter (all versions) in non-emulation mode. Uses an ascii protocol over serial. This supports the simplified ftdi:<serial number> addressing scheme. --ha7e=port (HA7E) Embedded Data Systems HA7E adapter ( and HA7S ) in native ascii mode. --ha5=port | --ha5=port:a | --ha5=port:acg (HA5) Embedded Data Systems HA5 mutidrop adapter in native ascii mode. Up to 26 adapters can share the same port, each with an assigned letter. If no letter specified, the program will scan for the first response (which may be slow). --checksum | --no_checksum (HA5) Turn on (default) or off the checksum feature of the HA5 commu- nication. --passive=port | --ha2=port | --ha3=port | --ha4b=port (Passive) Passive 1-wire adapters. Powered off the serial port and using passive electrical components (resitors and diodes). --8bit | --6bit (Passive) Synthesize the 1-wire waveforme using a 6-bit (default) serial word, or 8-bit word. Not all UART devices support 6 bit opera- tion. --timeout_serial=5 Timeout (in seconds) for all serial communications. 5 second de- fault. Can be altered dynamically under /settings/timeout/serial * USB devices The only supported true USB bus masters are based on the DS2490 chip. The most common is the DS9490R which has an included 1-wire ID slave with family code 81. There are also bus masters based on the serial chip with a USB to ser- ial conversion built in. These are supported by the serial bus master protocol. -u | --usb DS2490 based bus master (like the DS9490R). -u2 | --usb=2 Use the second USB bus master. (The order isn't predicatble, however, since the operating system does not consistently order USB devices). -uall | --usb=ALL Use all the USB devices. --usb_flextime | --usb_regulartime Changes the details of 1-wire waveform timing for certain net- work configurations. --altusb Willy Robion's alternative USB timing. --timeout_usb=5 Timeout for USB communications. This has a 5 second default and can be changed dynamically under /settings/timeout/usb * I2C devices I2C is 2 wire protocol used for chip-to-chip communication. The bus masters: DS2482-100, DS2482-101 and DS2482-800 can specify (via pin voltages) a subset of addresses on the i2c bus. Those choices are i2c_address 0,1,2,3 0x18,0x19,0x1A,0x1B 4,5,6,7 0x1C,0x1D,0x1E,0x1F (DS2482-800 only) port for i2c masters have the form /dev/i2c-0, /dev/i2c-1, ... -d port | --device=port This simple form only permits a specific port and the first available i2c_address --i2c=port | --i2c=port:i2c_address | --i2c=port:ALL Specific i2c port and the i2c_address is either the first, spe- cific, or all or them. The i2c_address is 0,1,2,... --i2c | --i2c=: | --i2c=ALL:ALL Search the available i2c buses for either the first, the first, or every i2c adapter. The DS2482-800 masters 8 1-wire buses and so will generate 8 /bus.n en- tries. * Network devices These bus masters communicate via the tcp/ip network protocol and so can be located anywhere on the network. The network_address is of the form tcp_address:port E.g. 192.168.0.1:3000 or localhost:3000 --link=network_address LinkHubE network LINK adapter by iButtonLink --ha7net=network_address | --ha7net HA7Net network 1-wire adapter with specified tcp address or dis- covered by udp multicast. By Embedded Data Systems --timeout_ha7=60 specific timeout for HA7Net communications (60 second default). --etherweather=network_address Etherweather adapter -s network_address | --server=network_address Location of an owserver (1) program that talks to the 1-wire bus. The default port is 4304. --timeout_network=5 Timeout for network bus master communications. This has a 1 sec- ond default and can be changed dynamically under /settings/time- out/network * Simulated devices Used for testing and development. No actual hardware is needed. Useful for separating the hardware development from the rest of the software design. devices is a list of comma-separated 1-wire devices in the following formats. Note that a valid CRC8 code is created automatically. 10,05,21 Hexadecimal family codes (the DS18S20, DS2405 and DS1921 in this example). 10.12AB23431211 A more complete hexadecimal unique address. Useful when an ac- tual hardware device should be simulated. DS2408,DS2489 The 1-wire device name. (Full ID cannot be speciifed in this format). --fake=devices Random address and random values for each read. The device ID is also random (unless specified). --temperature_low=12 --temperature_high=44 Specify the temperature limits for the fake adapter simulation. These should be in the same temperature scale that is specified in the command line. It is possible to change the limits dynami- cally for each adapter under /bus.x/interface/settings/simu- lated/[temperature_low|temperature_high] --tester=devices Predictable address and predictable values for each read. (See the website for the algorhythm). * w1 kernel module This a linux-specific option for using the operating system's access to bus masters. Root access is required and the implementation was still in progress as of owfs v2.7p12 and linux 2.6.30. Bus masters are recognized and added dynamically. Details of the physi- cal bus master are not accessible, bu they include USB, i2c and a num- ber of GPIO designs on embedded boards. Access is restrict to superuser due to the netlink broadcast protocol employed by w1. Multitasking must be configured (threads) on the compi- lation. --w1 Use the linux kernel w1 virtual bus master. --timeout_w1=10 Timeout for w1 netlink communications. This has a 10 second de- fault and can be changed dynamically under /settings/timeout/w1 FTDI ADDRESSING FTDI is a brand of USB-to-serial chips which are very common. If your serial device is connected via a USB serial dongle based on a FTDI chip, or if your adapter uses a built-in FTDI USB chip (for example, the LinkUSB), you can use this FTDI addressing. The main benefit with this mode of access is that we can decrease the communication delay, yielding twice as fast 1-Wire communication in many cases. The following values for port can be used to identify a specific FTDI port in several of the serial devices options. Note that this requires that OWFS is built with libftdi support, which might not be the case in standard repositories. ftdi:d:<device-node> path of bus and device-node (e.g. "003/001") within usb device tree (usually at /proc/bus/usb/ or /dev/bus/usb/) ftdi:i:<vendor>:<product> first device with given vendor and product id, ids can be deci- mal, octal (preceded by "0") or hex (preceded by "0x") ftdi:i:<vendor>:<product>:<index> as above with index being the number of the device (starting with 0) if there are more than one ftdi:s:<vendor>:<product>:<serial number> the device with given vendor id, product id and serial number string The above formats are parsed fully by libftdi (minus the ftdi: prefix). Simplified device serial-only support An additional format is supported, for certain bus types. This only specifies the USB serial number. ftdi:<serial number> Identifies a FTDI device by serial number only. Currently, this is only valid for the VID/PID found on the LinkUSB (i.e. --link). Note that those VID/PID's are the default for any FT232R device, and in no way exclusive to LinkUSB. Permsissions In order to run owserver (1) without root privileges - as you should, you must have sufficient permissions to the raw USB node your adapter is connected to e.g. "003/001" (usually at /proc/bus/usb/ or /dev/bus/usb/). An easy way to achieve this would be using chown (1): sudo chown :<your user> /dev/bus/usb/003/001 changes the group of the raw USB node "003/001" from default "root" to "<your user>" You can also write a udev (1) rule for your adapter: SUBSYSTEM=="usb", DRIVER=="usb", ATTR{idVendor}=="0403", ATTR{idProd- uct}=="6001", ATTR{serial}=="AK0048A0", GROUP="owsrv" saved as a file e.g. "10-FTDI-LinkUSB.rules" in "/etc/udev/rules.d/", this rule will automate the process of changing the group to "owsrv" of the raw USB node the LinkUSB adapter with S/N:AK0048A0 is connected to. Serial USB node Communication in FTDI mode accesses the RAW USB node and NOT the serial USB node your OS might have created automatically e.g. /dev/ttyUSB0. As a side effect, if existing, the serial USB node e.g. /dev/ttyUSB0 is removed on successful starting of owserver (1). After it's termination un- and re-plugging the adapter, or un- and reloading of the module ftdi_sio will recreate the serial USB node. Finding FTDI related information on your USB adapter owusbprobe is THE tool to find the information needed for direct FTDI addressing However this tool might not yet be packaged in your version. Alterna- tively you can also use lsusb to find the usb node your adapter is con- nected to, and then use lsusb again on this very node: sudo lsusb -D /path/to/your/raw/USB/device/node |egrep "idVendor|id- Product|iSerial" sudo is necessary to get the value of iSerial field, if the per- missions are still unchanged Examples FTDI addressing owserver -d ftdi:s:0x0403:0x6001:A800bXHr starts owserver with a LinkUSB (VID:0x0403,PID:0x6001,S/N:A800bXHr) as bus master in DS2480B- based emulation mode with direct FTDI access owserver --link=ftdi:A800bXHr starts owserver with a LinkUSB (S/N:A800bXHr) as bus master identified by serial number only in native mode with direct FTDI access TEMPERATURE SCALE OPTIONS -C --Celsius -F --Fahrenheit -K --Kelvin -R --Rankine Temperature scale used for data output. Celsius is the default. Can also be changed within the program at /settings/units/tempera- ture_scale PRESSURE SCALE OPTIONS --mbar (default) --atm --mmHg --inHg --psi --Pa Pressure scale used for data output. Millibar is the default. Can also be changed within the program at /settings/units/pres- sure_scale FORMAT OPTIONS Choose the representation of the 1-wire unique identifiers. OWFS uses these identifiers as unique directory names. Although several display formats are selectable, all must be in family- id-crc8 form, unlike some other programs and the labelling on iButtons, which are crc8-id-family form. -f --format="f[.]i[[.]c]" Display format for the 1-wire devices. Each device has a 8byte address, consisting of: f family code, 1 byte i ID number, 6 bytes c CRC checksum, 1 byte Possible formats are f.i (default, 01.A1B2C3D4E5F6), fi fic f.ic f.i.c and fi.c All formats are accepted as input, but the output will be in the speci- fied format. The address elements can be retrieved from a device entry in owfs by the family, id and crc8 properties, and as a whole with address. The reversed id and address can be retrieved as r_id and r_address. JOB CONTROL OPTIONS -r --readonly -w --write Do we allow writing to the 1-wire bus (writing memory, setting switches, limits, PIOs)? The write option is available for symmetry, it's the default. -P --pid-file filename Places the PID -- process ID of owfs into the specified filename. Use- ful for startup scripts control. --background | --foreground Whether the program releases the console and runs in the background af- ter evaluating command line options. background is the default. --error_print=0|1|2|3 =0 default mixed destination: stderr foreground / syslog background =1 syslog only =2 stderr only =3 /dev/null (quiet mode). --error_level=0..9 =0 default errors only =1 connections/disconnections =2 all high level calls =3 data summary for each call =4 details level >4 debugging chaff --error_level=9 produces a lot of output CONFIGURATION FILE -c file | --configuration file Name of an owfs (5) configuration file with more command line parame- ters HELP OPTIONS See also this man page and the web site http://www.owfs.org -h --help=[device|cache|program|job|temperature] Shows basic summary of options. device 1-wire bus master options cache cache and communication size and timing program mountpoint or TCP server settings job control and debugging options temperature Unique ID display format and temperature scale -V --version Version of this program and related libraries. TIME OPTIONS Timeouts for the bus masters were previously listed in Device options. Timeouts for the cache affect the time that data stays in memory. De- fault values are shown. --timeout_volatile=15 Seconds until a volatile property expires in the cache. Volatile prop- erties are those (like temperature) that change on their own. Can be changed dynamically at /settings/timeout/volatile --timeout_stable=300 Seconds until a stable property expires in the cache. Stable properties are those that shouldn't change unless explicitly changed. Memory con- tents for example. Can be changed dynamically at /settings/timeout/stable --timeout_directory=60 Seconds until a directory listing expires in the cache. Directory lists are the 1-wire devices found on the bus. Can be changed dynamically at /settings/timeout/directory --timeout_presence=120 Seconds until the presence and bus location of a 1-wire device expires in the cache. Can be changed dynamically at /settings/timeout/presence There are also timeouts for specific program responses: --timeout_server=5 Seconds until the expected response from the owserver (1) is deemed tardy. Can be changed dynamically at /settings/timeout/server --timeout_ftp=900 Seconds that an ftp session is kept alive. Can be changed dynamically at /settings/timeout/ftp EXAMPLE owhttpd -p 3001 -d /dev/ttyS0 Web server runs on tcp port 3001, serial adapter at ttyS0 owhttpd -p 3001 -s littlehost:4304 --error_level=3 Web server on port 3001, from owserver process on host "little- host", extensive error messages. owhttpd -p 3001 -u -u2 -r Read-only web server on port 3001, using two usb adapters. AVAILABILITY http://www.owfs.org 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 AUTHOR Paul Alfille (paul.alfille@gmail.com) OWFS Manpage 2004 OWHTTPD(1)
NAME | SYNOPSIS | DESCRIPTION | SPECIFIC OPTIONS | Device Options (1-wire Bus Master) | * Serial devices | * USB devices | * I2C devices | * Network devices | * Simulated devices | * w1 kernel module | FTDI ADDRESSING | TEMPERATURE SCALE OPTIONS | PRESSURE SCALE OPTIONS | FORMAT OPTIONS | JOB CONTROL OPTIONS | CONFIGURATION FILE | HELP OPTIONS | TIME OPTIONS | EXAMPLE | AVAILABILITY | SEE ALSO | AUTHOR
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