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If I run my Snap4Arduino code on an HTTPS page I get this error from Chrome:

mqttws.js:1046 Mixed Content: The page at 'https://snap.berkeley.edu/snapsource/snap.html' was loaded over HTTPS, but attempted to connect to the insecure WebSocket endpoint 'ws://raspberrypi.local:1884/mqtt'. This request has been blocked; this endpoint must be available over WSS.

Note that in Snap4Arduino there is no need -- it somehow finds out the board type. (At least among a list of known boards.)

I guess using HTTP it would be the JavaScript equivalent of this example:

curl -d '{"sketch":"foo.ino", "src":"LyoKICogQXV0aG9yOiBHw7ZyYW4gS3JhbXBlCiAqCiAqLwoKdm9pZCBzZXR1cCgpIHsKICBwaW5Nb2RlKDEzLCBPVVRQVVQpOwp9Cgp2b2lkIGxvb3AoKSB7CiAgbGVkX29uKCk7CiAgZGVsYXkoMTAwMCk7CiAgbGVkX29mZigpOwogIGRlbGF5KDEwMDApOwp9Cgp2b2lkIGxlZF9vbigpCnsKICBkaWdpdGFsV3JpdGUoMTMsIDEpOwp9Cgp2b2lkIGxlZF9vZmYoKQp7CiAgZGlnaXRhbFdyaXRlKDEzLCAwKTsKfQo="}' --header "Content-Type:application/json" http://raspberrypi.local:8080/verify

How about MQTT ?

ArduinoIDE parses error messages from GCC and reconstructs them on output - but failed to bring along column numbers for errors. This is fixed in this PR (and associated build):

arduino/Arduino#6897

We can grab that build (although PR not merged in kosher repo yet) and fix it on our side so that error markers not only point at a line, but also at a column number. Also fix editor UI.