How many advertisement device can i read with my single broadcaster (nrf52840)

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Venkat RAM — Wed, 14 Jun 2023 12:12:15 GMT

Thanks for the response

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Simonr — Wed, 14 Jun 2023 11:49:00 GMT

Thank you for explaining your use case. I don't think Bluetooth LE would be the best protocol to use for something like this, as there is no guarantee that an observer will scan every beacon device there is. Per the specification there's no way to ensure that you scan all available devices I'm afraid, so there's always a chance that some of these ID cards will go unnoticed. So if it's important that there's a 100% coverage Bluetooth LE won't be the best protocol for this use case. The number of beacon's will likely not be the issue, but rather the lack of a way to confirm that all beacons that passed was in fact scanned.

Best regards,

Simon

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Venkat RAM — Tue, 13 Jun 2023 12:31:11 GMT

Let me explain

each and every student have a id card with beacon device mounted to it

i need to read the mac id of all beacon while student passing through the main entrance gate where i place my observer

while 50 student cross the main entrance gate at the same time , i need to read all the their beacon data in my observer

here count 50 mentioned for understanding

i need to know, how many beacon's data can read by observer at a time

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Simonr — Tue, 13 Jun 2023 12:06:49 GMT

I think you need to be more specific here. What does "at the same time" mean in this context. For how long will these 100 beacons be advertising and for how long will the observer be scanning for. If you do something like the nRF Connect mobile app is doing and store and list the IDs/device names of the devices you detect it should be possible to scan all 100 (or close to) if they're in a low noise environment and not too far away from the scanning device, and the scanning is ongoing for a minute or so.

In theory this is not a problem, but you'll have to test to find out if it works out in the environment you're planning on using it in, etc.

Best regards,

Simon

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Venkat RAM — Mon, 12 Jun 2023 10:20:54 GMT

Hai, the case was , i need to read the unique id of several beacon at a time without establishing the connection by single observer

my query is at a instance how many unique id data of beacon will be readed or scanned by single observer

for example , 100 movable beacon crossing over the single observer at same time, how many beacon data scanned or readed by observer

and also maximum how many beacon data scanned or readed by single observer

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Simonr — Mon, 12 Jun 2023 09:05:25 GMT

The only limiting factor for the amount of devices you can scan and/or connect to in the nRF Connect SDK is the memory of the device you're using as the observer. Are you planning on connecting to broadcasters or just scanning for data?

If you're scanning for data, the memory won't be a big issue either, just the timing of actually scanning the different devices. Either way there is no hard limit, so how many devices are you planning to use as broadcasters, and what is the use case here exactly? If I recall correctly we have tested with 64 concurrent connections on our end without any big issues, and if you don't need to connect either I expect you won't have trouble with much higher peripheral counts either.

Best regards,
Simon

RE: How many advertisement device can i read with my single broadcaster (nrf52840)

Venkat RAM — Fri, 09 Jun 2023 12:19:20 GMT

Sorry my title was

"How many advertisement device can i read with my single observer (nrf52840)"