SYNOPSIS

      # IMPORTANT: the API is subject to change
    
      my $ow = AnyEvent::OWNet->new(host => '127.0.0.1',
                                    on_error => sub { warn @_ });
    
      # Read temperature sensor
      $ow->read('/10.123456789012/temperature',
                sub {
                  my ($res) = @_;
                  # ...
                });
    
      # List all devices
      my $cv;
      $cv = $ow->devices(sub {
                           my $dev = shift;
                           print $dev, "\n";
                         });
      $cv->recv;
    
      # Read the temperatures of all devices that are found
      $cv = $ow->devices(sub {
                           my $dev = shift;
                           $cv->begin;
                           $ow->get($dev.'temperature',
                                    sub {
                                      my $res = shift;
                                      $cv->end;
                                      my $value = $res->{data};
                                      return unless (defined $value);
                                      print $dev, ' = ', 0+$value, "\n";
                                    });
                         });
      $cv->recv;
    
      # short version of the above
      $cv = $ow->device_files(sub {
                                my ($dev, $file, $value) = @_;
                                print $dev, ' = ', 0+$value, "\n";
                              }, 'temperature');
      $cv->recv;
    
      # read humidity as well
      $cv = $ow->device_files(sub {
                                my ($dev, $file, $value) = @_;
                                print $dev, $file, ' = ', 0+$value, "\n";
                              }, ['temperature', 'humidity']);
      $cv->recv;

DESCRIPTION

    AnyEvent module for handling communication with an owfs 1-wire server
    daemon.

    Constructs a new AnyEvent::OWNet object. The parameter hash can contain
    values for the following keys:

    host

      The host IP of the running owserver daemon. Default is the IPv4
      loopback address, 127.0.0.1.

    port

      The TCP port of the running owserver daemon. Default is 4304.

    timeout

      The timeout in seconds to wait for responses from the server. Default
      is 5 seconds.

    Perform an OWNet read operation for the given path.

    Perform an OWNet write operation of the given value to the given path.

    Perform an OWNet dir operation for the given path. The callback will be
    called once with the list of directory entries in the data field which
    isn't consistent with the (misguided?) low-latency intent of this
    operation so using dirall() probably makes more sense provided the
    server supports it.

    Perform an OWNet present check on the given path.

    Perform an OWNet dirall operation on the given path.

    Perform an OWNet get operation on the given path.

    Perform an OWNet dirall operation on the given path.

    Perform an OWNet get operation on the given path.

    This method returns the AnyEvent condvar that is used to track all
    outstanding operations. It can also be used to set the initial value
    but this is only sensible when no operations are currently outstanding
    and is not normally necessary.

    This method is called on error or when the closing the connection to
    free up resources and notify any receivers of errors.

    This method connects to the owserver daemon. It is called automatically
    when the first command is attempted.

    This method identifies all devices below the given path (or '/' if the
    path is not given). An AnyEvent condvar may also be supplied that will
    be used to track begin and end of all actions carried out during the
    identification process. If no condvar is provided then one will be
    created. The condvar used is returned by this method.

    The supplied callback is called for each device with the path to each
    device as the first argument and the condvar for the operation as the
    second argument. The intention of passing the callback the condvar
    (that if not provided is created by the initial call) is to enable the
    callbacks that need to make further asynchronous calls to use begin
    calls and end calls (in the async callback) on the condvar so that the
    complete operation may be tracked. See the "SYNOPSIS" for an example.

    This method currently assumes that the owserver supports the getslash
    function and if this is not the case it will fail.

    Visit each device using devices() and call the callback with the result
    of successful get() calls for $file relative to each device found. If
    $file is an array reference each array element is treated as a relative
    file.

    This method is used to register an AnyEvent::Handle read type to read
    OWNet replies from an owserver daemon.

TODO

    The code assumes that the owserver supports persistence and does not
    check the response flags to recognize when it does not.

SEE ALSO

    AnyEvent(3)

    OWFS Website: http://owfs.org/

    OWFS Protocol Document:
    http://owfs.org/index.php?page=owserver-protocol

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