Sniffer + Wireshark Throughput

RE: Sniffer + Wireshark Throughput

David Edwin — Tue, 28 Feb 2017 09:25:46 GMT

Please accept my answer if you are happy with it :) , Thanks

RE: Sniffer + Wireshark Throughput

radioschmadio — Mon, 27 Feb 2017 16:30:06 GMT

Boom. Time between packets in wireshark now 8.625 ms. You just saved me from months of developing my own firmware. You are my hero! Tell your boss you deserve a raise.

RE: Sniffer + Wireshark Throughput

David Edwin — Mon, 27 Feb 2017 16:00:46 GMT

You should be able to use option h in the sniffer Windows PC console to set the sniffer on a single advertising channel, h 7 7 7 to set the advertising channel to be sniffed on. Let me know if this works for you

RE: Sniffer + Wireshark Throughput

endnode — Sun, 26 Feb 2017 10:28:06 GMT

Nordic nRF51 BLE sniffer software is not open source so we don't know how precisely it works. The obvious limitation is that only one nRF5x chip can listen to only one radio channel at the time so there is some hoping routine in the sniffer software which tries to capture all adv. packets on all 3 channels and that can be different then your broadcasting pattern. Btw. there are other commercial BLE sniffers which have more sophisticated radio designs (e.g. 4 chips/antennas;) and they can observe all channels at the time but they cost in range of thousands of USD;) So for 40 bucks you have pretty decent sniffer on Nordic DK and you need to accept some limitations... There are other open source variants such as Ubertooth which might help you but not on nRF5x chips. My assumption is that if you are able to write transmitting FW you will succeed in writing the listening as well;)

RE: Sniffer + Wireshark Throughput

Roger Clark — Sun, 26 Feb 2017 00:52:41 GMT

Sorry. I can't help on that front.

There may be code to receive without using the SD API, but I've not come across it (but its not something I've ever looked for)

RE: Sniffer + Wireshark Throughput

radioschmadio — Sat, 25 Feb 2017 21:01:11 GMT

Im not opposed to writing my own firmware. Ive seen the sensor beacon software that tx'es a packet without a softdevice, and I was able to go from there. github.com/.../solar_sensor_beacon

Do you know of any examples that show how to receive a packet without a softdevice?

RE: Sniffer + Wireshark Throughput

Roger Clark — Sat, 25 Feb 2017 20:42:17 GMT

I dont think you are likely to receive every packet.

AFIK, Bluetooth frequency hops, and although your transmitter is set always receive on the same frequency, the sniffer is running generic firmware which will somehow need to listen on all available channels.

I suspect the sniffer is not on listening on the same channel ( or band of channels) for some of your transmissions.

Unfortunately I dont think the source code to the sniffer has been published ( though I could be wrong), so its hard to know precisely how the sniffer operates