receive.m

传感器网络中的嵌入式操作系统源代码

function receive(functionName, message, port)
%RECEIVE
%This function registers a function to receive all incoming messages of
%a message type through certain PC ports.  If no ports are specified, all existing ports are used.
%
%Usage: 
%       receive(function, message, port);
%
% function: the string or function handle of a function, eg. 'myfunction'
% message: a subclass of net.tinyos.message.Message
% port: a socket, eg. 'localhost:9000' or a serial port, eg. 'COM1'

global COMM

if nargin<3
    port=COMM.sockets;
end

if iscell(port)
    for i=1:length(port)
        receive(functionName, message, port{i});
    end
    return
end

if ~ischar(port) | ~ischar(functionName) | ~isjava(message)
    disp(['usage: receive(''myFunction'', net.tinyos.oscope.OscopeMsg'')']);
    disp(['       receive(''myFunction'', net.tinyos.oscope.OscopeMsg'', ''COM1'')']);
    return
end

moteIF=connect(port);

%check for doubles
TF = strcmpi(COMM.functions, functionName) & strcmpi(COMM.messageTypes, message.getClass.toString.toCharArray');
moteIFs = [COMM.dataSource{TF}];
for i=1:length(moteIFs)
    if moteIFs(i)==moteIF return; end
end
    
mml = net.tinyos.matlab.MatlabMessageListener;
mml.registerMessageListener(functionName);
moteIF.registerListener(message, mml);

COMM.functions{end+1}=functionName;
COMM.messageTypes{end+1}=message.getClass.toString.toCharArray';
COMM.dataSource{end+1}=moteIF;
COMM.messageListener{end+1}=mml;