FindChannels

FindChannels[] gives a list of channels in your home area on the channel broker server.

FindChannels[None] gives a list of your unnamed channels.

FindChannels[All] gives a list of all channels owned by you.

FindChannels[form] gives a list of channels in your home area whose names match the string pattern form.

FindChannels["/�] gives a list of channels whose names match the string pattern "/abspath".

FindChannels["mqtts://…"] gives a list of channels whose names match the specified pattern representing a URL.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.