Firefox, MacOS, the serial

[githubhero]

Hi, I was trying to connect a little piece of very common hardware to ScratchX using the serial. I got the "green light" when they connected but they can't communicate since for some reason set_receive_handler never gets called.

Hw/Sw info:
MacOS Sierra 10.12.2
Firefox 50.1.0

[cwillisf]

set_receive_handler is something you'll need to call yourself. Conceptually the pattern is:

1. Your extension's deviceOpened function will be called with the new device.
2. In deviceOpened you should verify that the device in question is actually a device you're interested in. For example, with the PicoBoard extension we send a request for the PicoBoard to report its sensor values, and if we don't receive sensor values in a reasonable amount of time then we assume that the device must not be a PicoBoard.
3. Now that you know it's your device, call set_receive_handler with your extension's desired handler.

In reality, you almost certainly need to call set_receive_handler before step 2 so that you can receive the reply, and if you discover it's the wrong device you can set_receive_handler(null) as part of your "cancel" operation. I'd recommend checking out the PicoBoard extension as an example, starting at deviceOpened: https://github.com/LLK/scratchx/blob/gh-pages/scratch_extensions/picoExtension.js

[githubhero]

Hi @cwillisf, first of all thanks for your kind reply.

Sorry for expressing the concept so bad: I wanted to say that the callback you pass as an argument in set_receive_handler is never executed.

I knew the Picoboard code: mine is very similar but it is not working for me (moreover: I only have one connection with one device).

What happens:

• the device is connected and it regularly prints to the serial (I see it using CoolTerm): I click a physical button and I see it printing to the console;

• the device apparently gets connected to ScratchX (green color):
  Object { id: "/dev/tty.usbmodem1432", open: SerialDevice/this.open(), close: SerialDevice/this.close(), send: SerialDevice/this.send(), set_receive_handler: SerialDevice/this.set_receive_handler() }

• ScratchX is not printing/sending/writing to the serial;

• ScratchX is not receiving anything (I'm supposing I can catch something coming from the serial via set_receive_handler);

• _deviceRemoved never fires;

[jerryyip]

I have the same problem here. What should I do now? @thisandagain @cwillisf