broadcast

I am implementing a kind of IP finder for a particular type of network multimedia device. I want to find out all the alive devices of that type in the LAN, with their IP address and other details. The device has its own way of device discovery. It works as follows: A client sends a broadcast request over the LAN via UDP. The destination port number is fixed. In reply, all the servers in the LAN that understand the format of this request will respond to this request providing information about themselves. I am broadcasting the UDP request message using sendto(). Now my problem is that I don't

I want to implement a custom event that can be "broadcast", rather than sent to specific targets. Only those elements that have registered themselves as listeners for such events will receive them. What I have in mind would look as follows. First, in various places of the code, there would be statements of the form some_subscriber.on_signal( 'some_signal', some_handler ); I'm using the term signal as shorthand for "broadcast event". In the expression above, some_subscriber registers itself as a listener of one type (called 'some_signal') of such signals, by providing a handler for it.

I'm building an embedded system for a camera controller in Linux (not real-time). I'm having a problem getting the networking to do what I want it to do. The system has 3 NICs, 1 100base-T and 2 gigabit ports. I hook the slower one up to the camera (that's all it supports) and the faster ones are point-to-point connections to other machines. What I am attempting to do is get an image from the camera, do a little processing, then broadcast it using UDP to each of the other NICs. Here is my network configuration: eth0: addr: 192.168.1.200 Bcast 192.168.1.255 Mask: 255.255.255.0 (this is the

I'm using .NET 2.0 and have created a fairly simple udp broadcast app and UDP listener. Listener code: Socket listener = new Socket( AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp ); IPEndPoint localEndPoint = new IPEndPoint( IPAddress.Any, 11000 ); listener.Bind( localEndPoint ); EndPoint ep = (EndPoint)localEndPoint; Console.WriteLine("Ready to receive…"); byte[] data = new byte[1024]; int recv = listener.ReceiveFrom(data, ref ep); string stringData = Encoding.ASCII.GetString(data, 0, recv); Console.WriteLine("received: {0} from: {1}", stringData, ep.ToString()); listener

I've tried these phones: Motorolla Backflip 1.5, Nexus One 2.1 Basically I register BroadcastReceiver to get ACTION_HEADSET_PLUG broadcast and look on 3 extras that come in intent: state name microphone Here is the description from API: * state - 0 for unplugged, 1 for plugged. * name - Headset type, human readable string * microphone - 1 if headset has a microphone, 0 otherwise Issue #1: Broadcast comes when activity is started (not expected), when screen rotation happens (not expected) and when headset/headphones plugged/unplugged (expected). Issue #2: Backflip phone (1.5) sends null for

If I have an array of numerical values, which had to use object pointers instead of values as the data type, due to unequal vector lengths: In [145]: import numpy as np In [147]: a = np.array([[1,2],[3,4,5]]) In [148]: a Out[148]: array([[1, 2], [3, 4, 5]], dtype=object) In [150]: np.sin(a) --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) <ipython-input-150-58d97006f018> in <module>() ----> 1 np.sin(a) In [152]: np.sin(a[0]) Out[152]: array([ 0.84147098, 0.90929743]) How do I broadcast a function over the actual