Two way communication using Python (bleak) / Cannot discover services & characteristics

So you're running the code from this example? https://www.espruino.com/Interfacing#node-js-javascript

It seems that maybe it's trying to connect to the device twice, so you could try changing the code right at the top to:

var foundDevice = false;
noble.on('discover', function(dev) {
  if (foundDevice) return;
  console.log("Found device: ",dev.address);
  if (dev.address != ADDRESS) return;
  noble.stopScanning();
  foundDevice = true;
  connect(dev, function() {
    // Connected!
    write(COMMAND, function() {
      btDevice.disconnect();
    });
  });
});

Does the code make the Puck's light flash?

How does one press a button on the device to trigger the HTTP request on the raspberry pi? Then after that poll the puck for the temperature?

The best bet there is to use https://www.espruino.com/BLE+Advertising

So on the Puck:

var presses = 0;

function updateAdvertising() {
NRF.setAdvertising({},{manufacturer: 0x0590, manufacturerData:[presses,E.getTemperature()]});
}

setWatch(function() {                                                          
  presses++;                                                                   
  updateAdvertising();
}, BTN, {edge:"rising", repeat:1, debounce:20});
// update advertising with new temperature once a minute
setInterval(updateAdvertising, 60000); 
// update advertising right now
updateAdvertising();

And then use the code from https://www.espruino.com/BLE+Advertising#node-js - either JS or Python. The first byte you get will be the button press count - so when it changes you can do your HTTP request - and the second byte is the temperature, so there's no need to request it - you just always have it available.