Wi-Fi Fundamentals Lesson 3 Exercise 2 - net_zperf: setsockopt SO_BINDTODEVICE error (-2)

[zpm1066]

Hello,

After successfully building Wi-Fi Fundamentals Lesson 3, Exercise 2 under nRF Connect SDK v2.9.1 & using nRF5340-DK with nRF7002-EK, I get the net_zperf: setsockopt SO_BINDTODEVICE error (-2).

I've also repeated by building and then running the provided l3_e2_sol. I ran the perf test on two completely different networks and got the same error. 

In both cases, nRF5340DK / nRF7002-EK connected successfully to the iperf server running on the same network as the nRF device. However, the nRF device was unable to receive any packets. I suspect because of the setsockopt SO_BINDTODEVICE error.

Please review the outputs below.

[00:00:00.305,877] <inf> wifi_nrf_bus: SPIM spi@a000: freq = 8 MHz
[00:00:00.305,908] <inf> wifi_nrf_bus: SPIM spi@a000: latency = 0
[00:00:00.425,659] <inf> wifi_nrf: Management buffer offload enabled

[00:00:00.557,586] <inf> fs_nvs: 2 Sectors of 4096 bytes
[00:00:00.557,586] <inf> fs_nvs: alloc wra: 0, fd0
[00:00:00.557,586] <inf> fs_nvs: data wra: 0, f4
*** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***
[00:00:00.557,952] <inf> net_config: Initializing network
[00:00:00.557,983] <inf> net_config: Waiting interface 1 (0x20001e08) to be up...
[00:00:00.558,013] <inf> net_config: Running dhcpv4 client...
[00:00:00.558,288] <inf> Lesson3_Exercise2: Starting nrf5340dk with CPU frequency: 128 MHz
[00:00:00.558,471] <inf> wifi_supplicant: wpa_supplicant initialized
[00:00:01.533,355] <inf> wifi_mgmt_ext: Connection requested
[00:00:01.558,349] <inf> Lesson3_Exercise2: Waiting to connect to Wi-Fi
Connected
[00:00:07.383,575] <inf> net_dhcpv4: Received: 192.168.1.155
[00:00:07.383,636] <inf> net_config: IPv4 address: 192.168.1.155
[00:00:07.383,636] <inf> net_config: Lease time: 2592000 seconds
[00:00:07.383,666] <inf> net_config: Subnet: 255.255.255.0
[00:00:07.383,697] <inf> net_config: Router: 192.168.1.1
[00:00:07.383,758] <inf> Lesson3_Exercise2: Network connected
[00:00:10.383,880] <inf> Lesson3_Exercise2: IPv4 address 192.168.1.29
[00:00:10.383,880] <inf> Lesson3_Exercise2: Starting Wi-Fi throughput test: Zperf client
[00:00:10.383,911] <inf> Lesson3_Exercise2: New UDP session started
[00:00:10.384,063] <wrn> net_zperf: setsockopt SO_BINDTODEVICE error (-2)

[00:00:32.863,922] <inf> Lesson3_Exercise2: Wi-Fi throughput test: Upload completed!
[00:00:32.863,922] <inf> Lesson3_Exercise2: Upload results:
[00:00:32.863,922] <inf> Lesson3_Exercise2: 23536640 bytes in 20001 ms
[00:00:32.863,952] <inf> Lesson3_Exercise2: 22985 packets sent
[00:00:32.863,952] <inf> Lesson3_Exercise2: 82781 packets lost
[00:00:32.863,952] <inf> Lesson3_Exercise2: 0 packets received
[00:00:32.863,952] <inf> Lesson3_Exercise2: 9193 kbps throughput

iPerf server:

[ 2] local 192.168.1.29 port 5001 connected with 192.168.1.155 port 56794
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 2] 0.00-1.00 sec 577 KBytes 4.73 Mbits/sec 2.557 ms 544/1121 (49%)
[ 2] 1.00-2.00 sec 512 KBytes 4.19 Mbits/sec 2.488 ms 660/1172 (56%)
[ 2] 2.00-3.00 sec 612 KBytes 5.01 Mbits/sec 2.540 ms 536/1148 (47%)
[ 2] 3.00-4.00 sec 540 KBytes 4.42 Mbits/sec 3.276 ms 553/1093 (51%)
[ 2] 4.00-5.00 sec 620 KBytes 5.08 Mbits/sec 2.566 ms 602/1222 (49%)
[ 2] 5.00-6.00 sec 600 KBytes 4.92 Mbits/sec 2.505 ms 516/1116 (46%)
[ 2] 6.00-7.00 sec 604 KBytes 4.95 Mbits/sec 2.699 ms 559/1163 (48%)
[ 2] 7.00-8.00 sec 604 KBytes 4.95 Mbits/sec 2.481 ms 533/1137 (47%)
[ 2] 8.00-9.00 sec 597 KBytes 4.89 Mbits/sec 2.765 ms 564/1161 (49%)
[ 2] 9.00-10.00 sec 547 KBytes 4.48 Mbits/sec 2.528 ms 615/1162 (53%)
[ 2] 10.00-11.00 sec 608 KBytes 4.98 Mbits/sec 2.529 ms 554/1162 (48%)
[ 2] 11.00-12.00 sec 596 KBytes 4.88 Mbits/sec 2.671 ms 544/1140 (48%)
[ 2] 12.00-13.00 sec 596 KBytes 4.88 Mbits/sec 2.864 ms 527/1123 (47%)
[ 2] 13.00-14.00 sec 568 KBytes 4.65 Mbits/sec 2.673 ms 628/1196 (53%)
[ 2] 14.00-15.00 sec 608 KBytes 4.98 Mbits/sec 2.726 ms 534/1142 (47%)
[ 2] 15.00-16.00 sec 612 KBytes 5.01 Mbits/sec 2.562 ms 529/1141 (46%)
[ 2] 16.00-17.00 sec 512 KBytes 4.19 Mbits/sec 2.564 ms 650/1162 (56%)
[ 2] 17.00-18.00 sec 560 KBytes 4.59 Mbits/sec 2.566 ms 596/1156 (52%)
[ 2] 18.00-19.00 sec 560 KBytes 4.59 Mbits/sec 2.504 ms 589/1149 (51%)
[ 2] 19.00-20.00 sec 574 KBytes 4.70 Mbits/sec 3.580 ms 524/1098 (48%)
[ 2] 20.00-21.00 sec 0.000 Bytes 0.000 bits/sec 0.000 ms 0/0 (0%)
[ 2] 21.00-22.00 sec 0.000 Bytes 0.000 bits/sec 0.000 ms 0/0 (0%)
[ 2] 0.00-22.08 sec 11.3 MBytes 4.31 Mbits/sec 2.836 ms 11377/22985 (49%)

What would be the reason for the setsockopt error? Thank you.

Regards,
Ravi