Controlling puck.js over web BLE

The issue is that you have a quote inside a quote... Try:

<button onClick="Puck.write('NRF.setAdvertising([beacon.get(&quot;goo.gl/test123&quot;)]);\n');">Advertise</button>

Basically it's the web browser itself thinks the string onClick="... has ended when it sees the second quote.

There are other ways of doing it that are nicer, for instance you could use a third type of quotes! The templated String ones:

<button onClick="Puck.write('NRF.setAdvertising([beacon.get(`goo.gl/test123`)]);\n');">Advertise</button>
</body>

Or you could add a function inside a <script> tag and call that, because inside that function you won't have the quoting issues.