Tag Archives: iot

[Solved] Rtthread DCM component dcm_cache_save interface Error: mkdir:/data failed

The rtthread dcm data persistence component was used in the project, but mkdir:/data failed was reported during dcm_cache_save

But this error log is not the code of this project, it is confirmed that it is the log printed inside the dcm interface

Then confirmed that the macro #define DCM_DEFAULT_STORAGE_NAME “/user/data/db/dcm” is already in rtconfig.h

Declare that this macro is also useful for business code at system startup

The final investigation is because dcm_default_storage_name needs to be assigned when the system starts, and the dcm_strg.o of the dcm component depends on

If this variable is not assigned, it will default to mkdir:/data, but if /data has no permission, it will report that error.

So dcm_default_storage_name = DCM_DEFAULT_STORAGE_NAME is solved (it needs to be called at startup)

＜info＞ peer_manager_handler: Connection security failed

During the development of Nordic 52810, after the softdevice is re written, when nrfconnect for Mobile Connect is used, the connection fails, and the mobile phone displays peer removed pairing information. Device side log information:

< info> peer_ manager_ handler: Connection security failed: role: Peripheral, conn_ handle: 0x0, procedure: Encryption, error: 4102

Solution: in the Bluetooth settings of the mobile phone, find the device to be connected, select “ignore this device”, and re connect with nrfconnect. Success!