<![CDATA[UIFlow2.0 NVS how-to check pre-existence (ESP_ERR_NVS_NOT_FOUND)]]>Hi, I want to use NVS in UIFlow2.0 with blocks, but I think this is not possible.
Normally, you should read a nvs value and, if it does not exist, create it, but there is no block to check the existence of a variable, and reading a variable which does not exist causes the program to crash (ESP_ERR_NVS_NOT_FOUND).
How I can do that check? Can I catch the error so the program is not stopped?

]]>https://community.m5stack.com/topic/6102/uiflow2-0-nvs-how-to-check-pre-existence-esp_err_nvs_not_foundRSS for NodeSun, 15 Mar 2026 23:30:50 GMTSat, 17 Feb 2024 22:07:02 GMT60<![CDATA[Reply to UIFlow2.0 NVS how-to check pre-existence (ESP_ERR_NVS_NOT_FOUND) on Mon, 19 Feb 2024 10:02:51 GMT]]>Hello @txinto

you can wrap the get key block in a try / except block. See example M5Dial_NVS_UIFlow2.0.1 in the UIFlow2 Project Zone.

Thanks
Felix

]]>https://community.m5stack.com/post/23915https://community.m5stack.com/post/23915Mon, 19 Feb 2024 10:02:51 GMT