I had a working code that I made a slight modification to and compiled this evening.
Seems there is now an issue with MQTT, the application log keeps regurgitating errors from mg_ssl_if_mbedtls.c.
The error message is ‘HS defrag error: length mismatch.’
yes, it’s a regression, sorry.
change has been rolled back for further investigation, libraries are being rebuilt and published as we speak and should be up to date in 30 mins or so.
thanks for reporting and apologies for the breakage!