 
					
						
					
				
				
					I successfully worked around the issue by updating the /Library/Application Support/Perceptive Automation/Indigo 2022.1/Plugins/MySensors.indigoPlugin/Contents/Server Plugin
/plugin.py script to recognize the internal 21 code.
Here's the diff:
34c134,135
<     "GATEWAY_READY"             : [14, "Gateway ready",             ""]
"GATEWAY_READY"             : [14, "Gateway ready",             ""],
"DISCOVER_RESPONSE"         : [21, "Discover response",             ""]
715a717,719
        elif itemType == self.getInternalNumber("DISCOVER_RESPONSE"):
            # 21 Ignore
            pass
P.S. Indigo 2022.1 is complaining about this plugin that it won't be supported in future releases. Is there anyone out there planning to update this plugin?