in src/main/java/com/awslabs/aws/iot/websockets/BasicMqttOverWebsocketsProvider.java [285:296]
private String getEndpointAddressForRegion(Optional<Region> optionalRegion) {
if (!endpointMap.containsKey(optionalRegion)) {
DescribeEndpointRequest describeEndpointRequest = DescribeEndpointRequest.builder()
.endpointType("iot:Data-ATS")
.build();
String endpointAddress = getIotClient(optionalRegion).describeEndpoint(describeEndpointRequest).endpointAddress();
endpointMap.put(optionalRegion, endpointAddress);
}
return endpointMap.get(optionalRegion);
}