My code is shown as below, I create udp socket, set broadcast, bind receiveListener,and then send my request packet ipRequest to my udpServer:
receiveListener(info) {
let self = this;
console.log('wifiStore Recv from socket: ' + JSON.stringify(info));
}
startSearch() {
let self = this;
self.resetWifi();
if(window.chrome) {
let ipRequest = [{msgType: 'ipRequest'}];
let ipRequestStr = JSON.stringify(ipRequest);
chrome.sockets.udp.onReceiveError.addListener(self.receiveErrorListener.bind(this));
chrome.sockets.udp.onReceive.addListener(self.receiveListener.bind(self));
chrome.sockets.udp.create(function(createInfo) {
self._socketId = createInfo.socketId;
console.log('startSearch createInfo.socketId:' + self._socketId);
chrome.sockets.udp.bind(createInfo.socketId, '0.0.0.0', 0, function(result) {
console.log('startSearch bind result:' + result);
chrome.sockets.udp.setBroadcast(createInfo.socketId, true, function(result) {
console.log('startSearch setBroadcast result:' + result);
self._intervalId = setInterval(function() {
let message = self.stringToArrayBuffer(ipRequestStr);
chrome.sockets.udp.send(createInfo.socketId, message, '255.255.255.255', 8081, function(result) {
if (result < 0) {
console.log('startSearch fail: ' + result);
} else {
console.log('startSearch success ' + result);
}
});
} ,1000);
});
});
});
} else {
console.log('startSearch not window.chrome');
}
}
And my udpServer receive the request, as the log shown below:
serverLog - recv [{"msgType":"ipRequest"}](25 bytes) from client 192.168.1.112:63912 serverLog - recv [{"msgType":"ipRequest"}](25 bytes) from client 192.168.1.112:63912 serverLog - recv [{"msgType":"ipRequest"}](25 bytes) from client 192.168.1.112:63912
And the udpServer send the answer packet to my request client, the answer code is shown as below:
var serverSocket = dgram.createSocket('udp4');
serverSocket.on('message', function(msg, rinfo){
logger.warn('recv %s(%d bytes) from client %s:%d', msg, msg.length, rinfo.address, rinfo.port);
var msgStr = String(msg);
var message = JSON.parse(msgStr);
for (var i = 0; i < message.length; i++) {
if (message[i].msgType && message[i].msgType === 'ipRequest') {
if (ackFlag){
var ip = getIPAdress();
var ipAck = [{msgType: 'ipAck', IP: ip}];
var msg = JSON.stringify(ipAck);
logger.debug('ack to client');
serverSocket.send(msg, 0, msg.length, rinfo.port, rinfo.address);
}
}
}
});
And my request client receive the answer packet, but the data is null, as shown below:
Recv from socket: {"socketId":0,"data":{},"remoteAddress":"192.168.1.125","remotePort":8081} Recv from socket: {"socketId":0,"data":{},"remoteAddress":"192.168.1.125","remotePort":8081}
the data field is null, but my expected data is "var ipAck = [{msgType: 'ipAck', IP: ip}];"
Anyone who can show me why? Thanks very much!!!
By the way, the request client is a cordova app, and is tested on IPad
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent