Add port initialization and validation for SerialCommunicator

[sabicalija]

1. test all serial devices for AT COM support
2. proceed with first valid port

---

I've implemented the search strategy as discussed today. The easiest solution I could come up with is to provide a init() function for SerialCommunicator.

...
if (userAgent.indexOf(' electron/') > -1) {
    var promise = new Promise(function(resolve) {
        _communicator = new SerialCommunicator();
        _communicator.init().then(function () {
            resolve();
        });
    });
} else {
...

The init() function returns a Promise which is resolved after the correct port is set.

I've changed the communication with the serial device a bit. Right now the program tests if the serial device responds with FABI v2.3 after an AT ID command. This should be changed of course for the correct device (i.e., FlipMouse).

---

Wouldn't it be better to test for multiple FlipMouse devices and let the user select which one should be used?

[benjaminaigner]

Really nice work, thanks @sabicalija 👍

[benjaminaigner]

Maybe we use the parser event for a fully received line?
parser.on('data' ...

[sabicalija]

Oh. I didn't know about this possibility.

Sure. I think you're right. It's probably better to safeguard the communication/transmission somehow.

[benjaminaigner]

I think we can remove this block?

[sabicalija]

yep

[sabicalija]

We should eventually also think about how the app should behave when no device is connected or connected after the electron app has been started.

Currently, you'll only get some logs/errors in the console. However, you cannot restart the search after connecting a device.

[benjaminaigner]

also one case that can happen, a port which is not closed correctly:

-> I think the FLipMouse is still sending the live values (is started by the GUI with AT SR; values are used for live display of the sensor data), because the AT ER command to stop the raw value reporting is not sent.