After embedding

• some HTTP server content
• some root certificates
• code to output JSON formatted data (also the HTTP settings page just parses JSON data fetched via Javascript)
• a DNS library
• an SNTP library
• Mbed-TLS
• the Paho MQTT library

the flash consumption is 251KB and static memory consumption is around 78K currently.

Remember that we have 2048KB flash and 256KB memory at our disposal.