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KAA Failed to create kaa_configuration_manager_set_root_receiver

I want to control GPIO of endpoint (Raspberry pi 3).

I try to merge two KAA demo applications to one. ("Cassandra data analytics" and "Data collection")

Since there is only one demo for Raspberry Pi, I choose "Cassandra data analytics".

And I have used "Data collection demo" to control endpoint from kaa server.

Now, I want to implement control GPIO of endpoint from kaa server on "Cassandra data analytics".

Here is my procedure:

  1. Choose Application -> "Cassandra data analytics" on WEB UI.
  2. Add new schema (Configuration schemas) follow "Data collection demo" and I modify temperature to GPIO_PIN_4 (integer type).
  3. Generate SDK.
  4. Copy *tar.gz to "libs" folder

  5. Modify kaa_demo.c,

    1. add header file 

      #include "extensions/configuration/kaa_configuration_manager.h"
#include "extensions/configuration/kaa_configuration_manager.c"

    2. Configure notification manager in main()

      kaa_configuration_root_receiver_t receiver = {
    .context = NULL,
    .on_configuration_updated = on_configuration_updated
};

error_code = kaa_configuration_manager_set_root_receiver(
    kaa_client_get_context(kaa_client)->configuration_manager,
    &receiver);

Here, I got error_code = -4

Is anyone can tell me how to solve this error? Thanks

Solution

  • Error codes are defined in the src/kaa/kaa_error.h file. The particular error -4 is defined as KAA_ERR_BADPARAM, which means one of the parameters is wrong.

    If you check source code for kaa_configuration_manager_set_root_receiver function, it becomes obvious that one of the parameters is NULL. &receiver is guaranteed to be non-null, so the wrong parameter must be kaa_client_get_context(kaa_client)->configuration_manager.

    This is likely due to configuration extension been disabled. -DWITH_EXTENSION_CONFIGURATION=ON must be passed to the C SDK cmake command. Check your CMake file and change WITH_EXTENSION_CONFIGURATION value to ON.