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As suspected unsave byte/char handling. We converted the offending parts to TByte now. But it was also a problem because the code expected a byte converting to an integer value, but the message could have had legit anything else at this point. The trigger was an unusual message. Once we had a trace we could recreate it with our test hardware and it was obvious. The exception was many calls deep into the processing code and got only caught on the top of the call stack so we would have probably taken a few more days to really find this part. Perhaps we should add something like MadExcept. It's a shame that Delphi offers no inbuilt StackTrace at runtime.

As the browser's error message says, your server's certificate doesn't prove that 127.0.0.1 and mycomputer are the same entity, so the browser fails the handshake. Did you try connecting to https://mycomputer:4567 instead? The certificate you have is registered to a hostname, so that hostname must be specified in the URL used to access the server. See: Is it possible to have SSL certificate for IP address, not domain name?

Spring4D Events are just multicast events (like your regular OnClick but with possibly multiple handlers) - an event bus is more.

I have no idea how similar it is to Spring Events as I never used them.

Which will make it more difficult for us Delphi developers as there will be even more false positives with virus scanners.

This is a great interview with Anders Hejlsberg done recently. I learned a few things I didn't already know about the history of Delphi and why certain things in the programming world evolved the way they did. Anders has a very unique perspective from working at both Borland and Microsoft for as long as he has. I'm guessing that Anders is a few years younger than me from what he said here, and I can certainly appreciate the value of being able to look back on 40+ years of an industry that you watched get born and grow up.

I have updated the demo. The demo now includes saving and loading refresh tokens, as well as checking for expired access_tokens and refreshing them with the refresh_token. Have a look at https://github.com/geoffsmith82/GmailAuthSMTP/ Geoffrey

I've updated my project so it now not only sends messages via gmail... but it can send hotmail.com/live.com/outlook.com emails. GmailAuthSMTP supports the XOAUTH2 and OAUTHBEARER authentication types and so could probably support other mail providers if they use those standards as well. https://github.com/geoffsmith82/GmailAuthSMTP/

Hi @Ugochukwu Mmaduekwe, Have a look at https://github.com/geoffsmith82/GmailAuthSMTP/ I just created a simple demo for you. You will need to get a client_id from google in their developer toolbox. Geoffrey