RE: CoAP server, send max amount of data

sindrsch — Tue, 03 May 2016 16:31:40 GMT

Thanks a lot, this worked great. Exactly what I needed!

RE: CoAP server, send max amount of data

Glenn Ruben Bakke — Tue, 03 May 2016 07:56:24 GMT

Hi Sindre,

I recommend you to take a look at the define in sdk_config.h defining the maximum CoAP Payload size, COAP_MESSAGE_DATA_MAX_SIZE 256. Also, you could enabling memory manager statistics to see whether you are starving any the memory.

By default, the configurations are:

MEMORY_MANAGER_SMALL_BLOCK_COUNT      8
MEMORY_MANAGER_SMALL_BLOCK_SIZE       128
MEMORY_MANAGER_MEDIUM_BLOCK_COUNT     4
MEMORY_MANAGER_MEDIUM_BLOCK_SIZE      256
MEMORY_MANAGER_LARGE_BLOCK_COUNT      1
MEMORY_MANAGER_LARGE_BLOCK_SIZE       1024

Normally, you would if you sent small packets (< 128) use the SMALL buffers. As you describe you are using > 128 bytes payloads, which could indicate that you would need to increase the number of medium buffers.

To get a statistic in your code which you can use to debug the memory, you can enable this by adding these two defines to your sdk_config.h:

#define MEM_MANAGER_ENABLE_DIAGNOSTICS 1
#define MEM_MANAGER_DIAGNOSTICS_LOGS_ONLY 1

You can now call the nrf_mem_diagnose() whenever you like to see the state of the memory usage.

Please let me know if you get any results.

Cheers, Glenn