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window.ble = function(){
    console.log('handling click');
    navigator.bluetooth.requestDevice({
    filters:[
        {name: 'gatt_mark', services: [0xffd0]}
    ]
    })
    .then(function(device){
        console.log('device');

        return device.gatt.connect();
    })
    .then(function(server){
        console.log('server');
        return server.getPrimaryService(0xffd0);
    })
    .then(function(service){
        console.log('service');
        return Promise.all([service.getCharacteristic(0xfff1), service.getCharacteristic(0xfff2)]);
    })
    .then(function(gatt_char){
        debugger;
        gatt_char[0].readValue().then(function(buf){ alert( (new TextDecoder()).decode(buf) ) })
        //gatt_char.startNotifications
        //
    })
    .catch(function(e){ debugger; })

}

var dn = false;
if(!dn) {
    document.addEventListener('click', window.ble);
    dn = true;
}