Example DPP Easy Connect Tx Fail

[nottledim]

I'm trying the example

esp-idf/examples/wifi/wifi_easy_connect/dpp-enrollee

and find it frequently fails but not always.

I (1199) phy_init: phy_version 4670,719f9f6,Feb 18 2021,17:07:07
I (1309) wifi:mode : sta (50:02:91:86:33:b8)
I (1309) wifi:enable tsf
I (1309) wifi dpp-enrollee: Started listening for DPP Authentication
E (3639) wifi dpp-enrollee: DPP Auth failed (Reason: ESP_ERR_DPP_TX_FAILURE), retry...
[/code]

The error occurs after the initiator sends authentication.

It's not clear why but the code stop working altogether i.e no more events or any interaction after ESP_SUPP_DPP_FAIL. It's supposed to retry but doesn't.

[nottledim]

Looking at logs it seems the error is in wpa_supplicant offchannel event handler

Code: Select all

D (6692) event: running post WIFI_EVENT:19 with handler 0x400e03c4 and context 0x3ffc6cd0 on loop 0x3ffbcd18
0x400e03c4: offchan_event_handler at /home/dick/src/esp/esp-idf-v4.4/esp-idf/components/wpa_supplicant/esp_supplicant/src/esp_dpp.c:449

E (6702) wifi dpp-enrollee: DPP Auth failed (Reason: ESP_ERR_DPP_TX_FAILURE), retry...

D (7212) event: running post WIFI_EVENT:20 with handler 0x400d7504 and context 0x3ffbe000 on loop 0x3ffbcd18
0x400d7504: event_handler at /home/dick/src/esp/projects/example-easy_connect/dpp-enrollee/main/dpp_enrollee_main.c:55

D (7212) event: running post WIFI_EVENT:20 with handler 0x400e03c4 and context 0x3ffc6d00 on loop 0x3ffbcd18
0x400e03c4: offchan_event_handler at /home/dick/src/esp/esp-idf-v4.4/esp-idf/components/wpa_supplicant/esp_supplicant/src/esp_dpp.c:449

The wpa debug log shows this:

Code: Select all

I (1271) wifi dpp-enrollee: Started listening for DPP Authentication
I (4071) wpa: DPP: Authentication Request from 32:15:74:32:91:a8
E (4081) wpa: curve: secp256r1

E (4081) wpa: prime len is 32

E (4081) wpa: Q_x: - hexdump(len=32):
E (4081) wpa: a4 9d 38 81 ef d5 3e 31 54 6c cd 08 ca 82 dd cc
E (4091) wpa: 96 77 25 ed 5d de ac 61 c9 86 db fc ee 7f 78 8e
E (4091) wpa: Q_y: - hexdump(len=32):
E (4101) wpa: f0 97 e0 aa 3e 20 cc 86 cb 5f 30 11 35 a1 35 8f
E (4101) wpa: bc 68 39 a1 a4 10 cb 2e 4c f8 b9 4d ac 38 40 ec
E (4111) wpa: d:      - hexdump(len=32):
E (4111) wpa: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E (4121) wpa: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E (4461) wpa: curve: secp256r1

E (4461) wpa: prime len is 32

E (4471) wpa: Q_x: - hexdump(len=32):
E (4471) wpa: 0a 28 1b b5 00 ee e9 2d 42 1b 5a 1a 3f 6e 75 ff
E (4471) wpa: 08 f2 5e 59 8c 6f 85 cb 4c 19 f7 bf 2e df b4 d8
E (4481) wpa: Q_y: - hexdump(len=32):
E (4481) wpa: af 6e ea a3 32 16 b8 43 12 c1 f0 75 24 a8 22 d1
E (4491) wpa: 23 5e 4a 05 75 ef 49 10 63 3a b0 f8 42 56 0d 3d
E (4501) wpa: d:      - hexdump(len=32):
E (4501) wpa: 58 e4 63 9e a0 4f 1a 4b 44 e8 ba 71 73 77 54 ad
E (4511) wpa: 4d 80 c1 62 c2 f5 0e 55 72 f5 e2 9c f2 b7 9b 53
E (4861) wifi dpp-enrollee: DPP Auth failed (Reason: ESP_ERR_DPP_TX_FAILURE), retry...

I don't know where these errors are coming from. I don't understand what the error means either. Perhaps someone can enlighten me.

[nottledim]

I can get it work by changing the AP channels. I had the same SSID on 2 different channels (both in the channel list) which I think perplexed it. Probably not ideal but no excuse for crashing.

[devjasta]

I'm hitting this as well, and is being discussed further here: https://github.com/espressif/esp-idf/issues/10615. I currently can't find a work-around, but more importantly I think we're dealing with an issue here that prevents production deployment of DPP due to the unpredictable errors without reliable (or currently even known) workarounds available in code.