Flash encryption and JSON files

[Marco Moraes 0]

Hello everyone.

First of all, I've been looking for a while for a related topic but I couldn't find. So, I'm sorry if this is a duplicate topic.

I could find a lot about the flash encryption, but I could not find if the application can write/modify a JSON file stored in the flash. I'll use BLE to change some configurations with the device in place and I need these changes to be permanent, so I chose the JSON file.

My question: can an encrypted flash on a LoPy (dev board and/or OEM) board have a JSON file that can be modified over BLE? More specifically, is it possible to use something like this:

with open('/flash/node_config.json','w') as fp:
    fp.write(json.dumps(self._cfg_file))

Thanks for your support.

[Pete Allen 0]

Hi Marco,

Normal file operations should work:

f = open('node_config.json', 'w')
f.write('some data')
f.close()

and

import os

for more.