Multiple Connections with HR and CSC beacons using nrf52832 dk as the central board

[Santosh Krishnan]

Hi,

I would like to connect nearly 20 heart rate bands to the nrf52832 which has to configured as the central board and has to collect all the heart rate data from the peripherals. I am using the Segger Embedded Studio with nrf52_sdk_15.0 examples. As of now I am just trying to communicate with only one heart rate device with the nrf52dk using BLE_HRS_C example, but the issue is that I am able to scan and establish the connection but only the battery service data is connection not the actual heart rate values. Is there any constraints that nordic dk can only communicate another nordic chip ? I have also tried to connect with the UART_C code too and facing the same issue. So What am I supposed to do to read the values ? There is no issue with the sensor since i am able to read the values with the nRF connect destop applicaton using the board and in the mobile application as well. And if this works out then what should i do for connection of multiple peripherals with the central device ? Which program should i use or alter for this data accumulation such are HRS_C, UART_C , Multilink_C etc. 

The Bands which i have tried are as follows: 

MIO-FUSE

MS1020

Xiomi

IR107 Plus HR (With nrf52832 chip and yet to be tested)

I have also tried the link given https://github.com/NordicPlayground/nrf52-ble-multi-link-multi-role. The link given is similar to our requirements but the given link was given for nrf52840 and its use s140. When I open the BLE_aggregator folder, it is given for pca100056 but ours is pca100040 and it doesn’t have the ses project. I have even tried with pca100056 i am able to build the project but it is not building since some of the libraries are missing. 

This is very crucial and I have been trying this for the past  month and not able to come up with a solution. Kindly revert as soon as possible.

Thank You

With Regards,

Santosh Krishnan

[Santosh Krishnan]

Hi Hung,

The mio fuse band which we are using is designed as per the Bluetooth SIG specifications it has heart rate GATT profile - 180D and the heart rate measurement characteristic - 2A37. There is no issue with the band and the nRF connect application. I just don't know why a fatal error comes and the debugger stops in "app_error_weak.c" page hence not able to read the data in the Segger Embedded Studio terminal. I have posted both the nRF connect screenshot and the RTT_log screen shot. In the heart rate service i have mentioned the peripheral name as MIO GLOBAL-FUSE so it scans for the band and connects then throws an error. Kindly help me out.

Thanks 

[Hung Bui]

Please define DEBUG in your preprocessor definition so you can find what causing the assertion. 

[Santosh Krishnan]

Hi,

I have tried the things you have told but it is not coming. Now it is throwing a new error and stops at app_error_weak file. Kindly check the attached screenshot below. The "NRF_ERROR_NOT_FOUND" been coming suddenly i have put a printf statement in the peer_data_storage loop, i think the error is from there or i might be wrong. Please check it out. 

  

Thanks and Regards,

Santosh Krishnan

[Hung Bui]

Could you check log there is a file and line of code that causing the error. Part of it is in the screenshot : G:\education\ .... 

[Santosh Krishnan]

Hi Sir,

Yes i checked that, it was due to the DEBUG which i added in Preprocessor definition and after i removed it again the fatal error is coming. This fatal error is coming for only MIO fuse band but for other bands these fatal errors does not arise nor it gives any data but they have different service uuid and the we want to use the MIO fuse band since it is more standardized and accurate. Please check the screenshots below you will see the difference.

. 

I don't know what is the issue. Please Help. 

Thanks,

Santosh Krishnan R