Challenges
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Challenges - How to Overcome Hardware and Software Limitations
The Arduino hardware is pretty limited - you get 32kB of unmodifiable (at run-time) flash memory for the program, and 2kB of modifiable SRAM memory for variables. That's it.
This is a challenge to your software you have to address at compile time. During operations you may want to change the configuration of the device. If you want do to that with re-programming the chip, you need to use an interface of some kind (wireless, SPI/ I2C, or SD card).
- Updating device configuration (ie, MQTT/ WLAN)
- Updating device code