GATT connection timeout?

Just to rule anything out, could you try calling startBonding after connect, and then try and read the information after that?

IMO it is not necessary, I am quite sure it is bonded now. Furthermore, I can discover services with

function Discover(){
    gatt.getPrimaryServices().then(function(­services) {
      console.log("Services:",services);
    }).catch(function(e){console.log("error:­ ",e);});
}

with the corresponding log:

Services: [
  BluetoothRemoteGATTService {
    "uuid": "0x1800",
    "isPrimary": true, "start_handle": 1, "end_handle": 7 },
  BluetoothRemoteGATTService {
    "uuid": "0x1801",
    "isPrimary": true, "start_handle": 8, "end_handle": 11 },
  BluetoothRemoteGATTService {
    "uuid": "0x0000[vendor]",
    "isPrimary": true, "start_handle": 12, "end_handle": 21 },
  BluetoothRemoteGATTService {
    "uuid": "0x180a",
    "isPrimary": true, "start_handle": 22, "end_handle": 34 },
  BluetoothRemoteGATTService {
    "uuid": "0x0000[vendor]",
    "isPrimary": true, "start_handle": 35, "end_handle": 44 },
  BluetoothRemoteGATTService {
    "uuid": "0x0000[vendor]",
    "isPrimary": true, "start_handle": 45, "end_handle": 65535 }
 ]

Actually 3 services with proprietary UUIDs are listed with 0x0000[vendor]. I suspect that it is the reason why I can't exchange with those services...

I just made a READ request on the "Generic Access" service (0x1800), characteristic "Device Name" (0x2A00) and I am able to retrieve the correct device name.