BLE OTS object transfer service throughput

RE: BLE OTS object transfer service throughput

Lucas12345 — Mon, 29 Mar 2021 00:33:18 GMT

hello,

no I sadly couldn't find one so I had to make an andoid application in andoid studio.

To read from a perpheral nrf device running OTS you need to connect to GATT then setup an l2cap channel using

BluetoothSocket.createL2capChannel (int psm) with a psm of 25

then send an OP code to the devices OACP characteristic using indication to request data to be sent over l2cap.
finally read from the l2cap channel and repeat.

one issue with this is that BluetoothSocket.createL2capChannel (int psm) is only available in android 10 or newer.

that's why ive switched to something based on nordic uart service instead.

RE: BLE OTS object transfer service throughput

Amanda Hsieh — Fri, 26 Mar 2021 08:22:36 GMT

Hi,

There are Experimental: Object Transfer Service Server Application. and Experimental: Object Transfer Service client Example, but they cannot support nRF Toolbox. Also, see my colleague's explanation in this post.

I could report your request to the internal, but no promise. Thanks for the suggestion.

-Amanda H.

RE: BLE OTS object transfer service throughput

goldwake — Thu, 25 Mar 2021 19:54:38 GMT

Did you manage to find an OTS example on android? I would love to quickly experiment with this before delving into writing code.

Amanda Hsieh, it would be great if there was an OTS application in NRF toolbox. Do you know if there are any plans for one?

RE: BLE OTS object transfer service throughput

Amanda Hsieh — Wed, 10 Mar 2021 07:05:56 GMT

Glad to know you find the issue.

-Amanda H.

RE: BLE OTS object transfer service throughput

Lucas12345 — Tue, 09 Mar 2021 15:51:44 GMT

Hi thanks for your help. I've tried adjusting those parameters and initially it didn't work but then I tried disabling nrf log and it worked haha. Turns out excessive logging can cause problems.

Thanks

RE: BLE OTS object transfer service throughput

Amanda Hsieh — Wed, 03 Mar 2021 14:03:04 GMT

Hi,

You can enable 2M PHY, and also increase MTU and the maximum packet length (both NRF_SDH_BLE_GAP_DATA_LENGTH and NRF_SDH_BLE_GATT_MAX_MTU_SIZE) - in combination with the shortest connection interval, you should get a throughput close to the phone's limit. You can refer to this ATT_MTU Throughput Example.

-Amanda H.