If I run the app on a Mac (Designed for iPhone), I get the error errSecParam (-50).

At AWSIoTManager.m Line:363 Replace with:

if (@available(iOS 14, )) {
publicKeyRef = SecTrustCopyKey(trust);
} else {
publicKeyRef = SecTrustCopyPublicKey(trust);
}

Please see my blog post for details: https://blog.mzying.com/index.php/archives/322