Commits on May 5, 2024

1. remove FirebaseJson lib from firmware (save 17.5k of flash) …

   we used this library solely to interpret the answer of an HTTP web
   server as JSON and find a particular value using a path expression in
   the HTTP power meter implementation.
   
   since we ran out of flash memory on non-S3 ESP32, we need to cut some
   corners. removing FirebaseJson is the last low-hanging fruit that we
   currently know of. we can get rid of it by using ArduinoJson (which is
   already integral part of the firmware) and implementing a custom logic
   to extract a value based on a path expression.
   
   other than the FirebaseJson path "finder", the new implementation
   only knows how to access sub-keys delimited by a forward slash. in
   particular, accessing array members is not supported any more. I am
   hoping that this is simply not an issue. if so, we will have users
   complaining and we can add this functionality in a later release.

   

   schlimmchen committed May 5, 2024
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2. remove rweather/Crypt lib from firmware (save 2.1k of flash) …

   mbedtls is already integral part of the firmware. use it in favor of
   rweather/Crypto library to calculate a sha256 checksum of a string, as
   used in the HTTP power meter implementation.

   

   schlimmchen committed May 5, 2024
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