Dear All,
I am using 2 development boards NRF52DK with NRF52832.
I changed in throughput example ( ncs/v1.7.0/nrf/samples/bluetooth/throughput ) characteristics to custom 128 bit and replaced filter to find proper MAC address.
When I testing it with example software ( central and peripheral ) I can achieve speed of ~1292 kbps
The issue appears when I test the same setup with S132 and SDK 14.2, I cannot achieve more than 4 kbps. I am writing to the same characteristics.
I can observe that PHY and ATT MTU are being changed.
Zephyr Central (ncs example):
==== Starting throughput test ====
PHY update pending
LE PHY updated: TX PHY LE 2M, RX PHY LE 2M
LE Data length update pending
LE data len updated: TX (len: 251 time: 1314) RX (len: 251 time: 1314)
^.-.^ ^..^
^-/ooooo+:.^ ^.--:+syo/.
^-/oooooooooooo+:. ^.-:::::+yyyyyy+:^
^-/+oooooooooooooooooo/-^ ^.-::::::::/yyyyyyyhhs/-
^-:/++++oooooooooooooooooooo+:. ^.-::::::::::::/yyyyyyyhhhhhho:^
^::///++++oooooooooooooooooooooooo//:::::::::::::::/yyyyyyyhhhhhddds
-::://+++ooooooooooooooooooooooooooooo+/:::::::::::/yyyyyyyhhhhhdddd^
-::::::/++ooooooooooooooooooooooooooooooo+/::::::::/yyyyyyyhhhhhdddd^
-:::::::::/+ooooooooooooooooooooooooooooossso+/::::/yyyyyyyhhhhhDisconnected (reason 0x13)
W: Disconnected while allFilter not match. Address: 54:13:54:4F:44:B8 (random) connectable: 1
ocating context
dGATT write failed (err -128)
Done
[local] sent 195200 bytes (190 KB) in 340312 ms at 4 kbps
Peripheral S132 SDK 14.2:
BLE_CONN_PARAMS_EVT_SUCCEEDED Connection interval: 400, timeout 4000 ms CONNECTED @ 42 Changing state: Advertising -> Connected Peer on connection 0x0 requested an ATT MTU of 247 bytes. Updating ATT MTU to 247 bytes (desired: 247) on connection 0x0.
I set on S132 SDK 14.2 peripheral board:
NRF_SDH_BLE_GAP_DATA_LENGTH 251 NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247
I have followed:
https://devzone.nordicsemi.com/f/nordic-q-a/44169/default-phy
https://devzone.nordicsemi.com/f/nordic-q-a/54295/how-to-enable-2mbps
https://devzone.nordicsemi.com/f/nordic-q-a/51082/can-t-enable-dle
https://devzone.nordicsemi.com/f/nordic-q-a/39787/verifying-connection-event-length-extension-and-data-length-extension
I have no clue, what could be cause of such different behavior and low throughput using S132 and SDK14.
Could you give any suggestions what more can be changed?
