configuration to be set for extemded packet with multilink example

[nikunj8086]

hi,

i am using sdk 14.2.0 multi-link central example,

my aim is to connect multiple sensors (up to 8 ble peripheral devices)  with extended packet enabled.

sensors will send 244 bytes of data at once per second.

i am using both nrf 52 devkits (pca10040 and pca10056) i am getting same response in both the boards,

when board is connected up to 3 sensors it works fine. but when 4th sensor is get connected and during discovery it self or any previously connected sensors get disconnected with error code 0x22. and code becomes unstable.

so my question is what all the configuration i have to check for.

thanks.

[Vidar Berg]

Hi,

Have you tried increasing the connection interval, supervision timeout, and slave latency? Also, what connection interval are you currently testing with? 

[nikunj8086]

hi,

these are the connection parameters i am using currently,

#define SCAN_INTERVAL             0x00A0                                 
#define SCAN_WINDOW               0x0050                                
#define SCAN_TIMEOUT              0x0000                                

#define MIN_CONNECTION_INTERVAL   MSEC_TO_UNITS(80, UNIT_1_25_MS)      
#define MAX_CONNECTION_INTERVAL   MSEC_TO_UNITS(160, UNIT_1_25_MS)       
#define SLAVE_LATENCY             0                                     
#define SUPERVISION_TIMEOUT       MSEC_TO_UNITS(4000, UNIT_10_MS)

[Vidar Berg]

I think it should work with those parameters, but as a test, can you try to lower the scan activity and increase the connection interval? The error code indicates that the device either failed to start or respond to LMP procedure. Also, do you see the same if you disable long MTU and LL packets?