var hubUrl = "/IoTCenter/hub?group=page";
var connection = new signalR.HubConnectionBuilder().withUrl(hubUrl).build();
var connectionId;
function connect() {
    if (connection.state === signalR.HubConnectionState.Disconnected) {
        connection.start().then(function () {
            console.log('signalR 连接成功');
        }).catch(function (err) {
            console.log(err);
            setTimeout(connect, 15 * 1000);
        });
    }
}
connection.on('Connected', function (id) {
    connectionId = id;
    console.log('signalR 连接Id:' + connectionId);
});
connection.on("ServerToClient", function (method, message, to, from) {
    console.log(method);
    console.log(message);
    var event = method.substr(0, 1).toLowerCase() + method.substr(1);
    var model = JSON.parse(message);
    store.dispatch('update', {event,model,to,from});
});