notification interval problem

[has]

Hello good morning,

I am using nrf52840 device. I am sending 20 bytes using notification at different notification intervals like 30ms, 80ms and 1sec. But at application side i got the same data but at different interval. At receiving side the packet and its time are as follow.

Data received at 1 sec interval are as follow:

5:25:30:912 1234567891011121314151617181920

5:25:32:11 101102103104105106107108109110111112113114115116117118119120

5:25:33:7 1234567891011121314151617181920

5:25:34:0 101102103104105106107108109110111112113114115116117118119120

5:25:34:996 1234567891011121314151617181920

5:25:35:990 101102103104105106107108109110111112113114115116117118119120

5:25:36:983 1234567891011121314151617181920

5:25:37:977 101102103104105106107108109110111112113114115116117118119120

5:25:38:969 1234567891011121314151617181920

5:25:39:965 101102103104105106107108109110111112113114115116117118119120

5:25:40:958 1234567891011121314151617181920

5:25:41:953 101102103104105106107108109110111112113114115116117118119120

5:25:42:946 1234567891011121314151617181920

5:25:44:337 101102103104105106107108109110111112113114115116117118119120

Data received at 100 ms interval are as follow:

6:42:42:844 1234567891011121314151617181920

6:42:42:936 101102103104105106107108109110111112113114115116117118119120

6:42:43:32 1234567891011121314151617181920

6:42:43:131 101102103104105106107108109110111112113114115116117118119120

6:42:43:277 1234567891011121314151617181920

6:42:43:375 101102103104105106107108109110111112113114115116117118119120

6:42:43:423 1234567891011121314151617181920

6:42:43:569 101102103104105106107108109110111112113114115116117118119120

6:42:43:617 1234567891011121314151617181920

6:42:43:713 101102103104105106107108109110111112113114115116117118119120

6:42:43:812 1234567891011121314151617181920

6:42:43:910 101102103104105106107108109110111112113114115116117118119120

6:42:44:8 1234567891011121314151617181920

6:42:44:105 101102103104105106107108109110111112113114115116117118119120

6:42:44:354 1234567891011121314151617181920

6:42:44:550 101102103104105106107108109110111112113114115116117118119120

time format = [hour:min:sec:milisec]

i just want to know reason behind this variation. I also want some suggestion to conclude the proper data rate.

Thank you

[Kenneth]

What are the connection parameters of the BLE link? For instance if you are trying to send notification every 1s, and the connection interval is 300ms, then you will get the data 0sec->1.2sec->0.9sec->0.9sec->1.2sec.... You might also of course have some packet loss, then the next try is next interval.

Best regards,
Kenneth