HTTPS support on Pico!

It works!

I tried your suggestion of deleting the keys after initiating the connection.

Updated code example:

SPI3.setup({ mosi:B5, miso:B4, sck:B3 });
var eth = require("WIZnet").connect(SPI3, A8);
eth.setIP();
eth.getIP();

var options = url.parse("mqtt://A1XXXXXXXXX9AA.iot.us-east-1.amazonaws.com:8883");
options.key = atob("MIIEow ... d4/IvHs");
options.cert = atob("MIIDWj ... +NrCQ==");
options.ca = atob("MIIE0z ... dao7WNq");

var mqtt = require("MQTT").create();
mqtt.on("connected", function() {
  console.log("connected to AWS IoT...");
  mqtt.subscribe("test/topic");
});

mqtt.on("publish", function (pub) {
  console.log("\r\nnew message received: ");
  console.log("topic: "+pub.topic);
  console.log("message: "+pub.message);
});

require("tls").connect(options, function(res) {
  console.log("tls connected");
  mqtt.connect(res);
});

delete options.key;
delete options.cert;
delete options.ca;

And the results:

Connecting with TLS...
Loading the CA root certificate...
Loading the Client certificate...
Loading the Client Key...
Performing the SSL/TLS handshake...
tls connected
Client connected
=undefined
>Verifying peer X.509 certificate...
MQTT connection accepted
connected to AWS IoT...
>
new message received:
topic: test/topic
message: hello world!

The 'hello world' message was published from another client application.

Exciting! Thanks for making this happen so quickly.