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How to catch the error thrown when unable to connect to an arduino?

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I am trying to write some code that will scan the COM ports for an arduino, and if none are found I would like to throw my own error. So I would like to catch this error somehow: "Unable to find Arduino hardware at COM3. First argument must be a valid serial port, IP address/hostname or Bluetooth address/name."
Is there a way to do this?
This function simply returns the COM port for use in creating an arduino object.
Here is my code:
function port = ports()
%% Description
% Searches for the COM Port that the arduino is connected to.
%
%% Try Block
ports = seriallist();
for i = 1:length(ports)
try
a = arduino(ports{i});
clear a
port = ports{i};
catch
clear a
end
end
end

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Accepted Answer

Walter Roberson
Walter Roberson on 22 Aug 2019
>> try; arduino("/dev/cu.Bluetooth-Incoming-Port"); catch ME; disp('nan nan nah'); end
nan nan nah
The particular exception is 'MATLAB:hwsdk:general:invalidPort' and arduino() without any arguments can also generate 'MATLAB:hwsdk:general:boardNotDetected'

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