Wifi screen not coming up

[iotechbugs]

Hi,

This is a very great library and its very handy too.

I see an issue. I found ESP32 device and discovered, but When i click discovered device following error is thrown. Could you help please?

I/flutter (31505): └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter (31505): EstablishSession error NoSuchMethodError: The method 'isConnected' was called on null.
I/flutter (31505): Receiver: null
I/flutter (31505): Tried calling: isConnected()
I/flutter (31505): ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter (31505): │ #0 WifiBloc._mapLoadToState
package:esp_provisioning_example/wifi_screen/wifi_bloc.dart:32
I/flutter (31505): │
I/flutter (31505): │ #1 WifiBloc.mapEventToState
package:esp_provisioning_example/wifi_screen/wifi_bloc.dart:21
I/flutter (31505): ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter (31505): │ ⛔ Error conencting to device Exception: Error establishSession
I/flutter (31505): └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter (31505): ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
I/flutter (31505): │ #0 WifiBloc._mapLoadToState
package:esp_provisioning_example/wifi_screen/wifi_bloc.dart:42
I/flutter (31505): │
I/flutter (31505): │ #1 WifiBloc.mapEventToState
package:esp_provisioning_example/wifi_screen/wifi_bloc.dart:21
I/flutter (31505): ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
I/flutter (31505): │ ⛔ Error scan WiFi network NoSuchMethodError: The method 'startScanWiFi' was called on null.
I/flutter (31505): │ ⛔ Receiver: null
I/flutter (31505): │ ⛔ Tried calling: startScanWiFi()
I/flutter (31505): └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

[tuanpmt]

hi @iotechbugs

Please log at this line: https://github.com/sunshine-tech/esp_provisioning/blob/0cc3d09ec329a25732d95a113c0ef0a869c83bb0/example/lib/ble_screen/ble_bloc.dart#L25 to see what's happen

[iotechbugs]

After selecting the following error is coming. Mobile I use is ONEPLUS 6 PLUS, VS code, OS is MAC

Which version of flutter you are using. I am able to scan BLE devices only once, If I select provisioning second time no device is visible.

Adding logs for your reference.

esp_prov.log

[xandros6]

The same problem from me. I'm comparing your implementation with ESP-IDF Android one, seem sone problem on encoding securitySession request.

The ESP32 logs this:

LE connection complete. handle=0 role=1 paddrtype=1 addr=77.77.e1.cd.f1.89 local_rpa=0.0.0.0.0.0 peer_rpa=0.0.0.0.0.0 itvl=39 latency=0 spvn_tmo=2000 mca=5
D (207171) protocomm_nimble: Inside BLE connect w/ conn_id - 0
ble_hs_hci_cmd_send: ogf=0x08 ocf=0x0016 len=2
0x16 0x20 0x02 0x00 0x00 
Command Status: status=0 cmd_pkts=5 ocf=0x16 ogf=0x8
LE Remote Used Features. handle=0 feat=0f 00 00 00 00 00 00 00 
ble_hs_hci_evt_acl_process(): conn_handle=0 pb=2 len=27 data=0x17 0x00 0x04 0x00 0x52 0x06 0x00 0x10 0x01 0x5a 0x25 0xa2 0x01 0x22 0x0a 0x20 0x3e 0xbf 0x36 0x7d 0x1e 0x1a 0x84 0xce 0xb7 0x15 0x04 
rxed att command: write cmd; conn=0 handle=0x0006
D (210511) protocomm_nimble: Write attempt for uuid = 021aff51-0382-4aea-bff4-6b3f1c5adfb4, attr_handle = 6, data_len = 20
D (210531) protocomm_nimble: UUID did not match... 51
D (210531) protocomm_nimble: UUID (0x51) matched with proto-name = prov-session
E (210541) security1: Unable to unpack setup_req
D (210541) protocomm: SEC_EP Req handler returned 258

Checking ESP-IDF source code I think this is the point that goes to error:

static esp_err_t sec1_decrypt(uint32_t session_id,
                              const uint8_t *inbuf, ssize_t inlen,
                              uint8_t *outbuf, ssize_t *outlen)
{
    if (*outlen < inlen) {
        return ESP_ERR_INVALID_ARG;
    }

    if (!cur_session || cur_session->id != session_id) {
        return ESP_ERR_INVALID_STATE;
    }
    *outlen = inlen;
    int ret = mbedtls_aes_crypt_ctr(&cur_session->ctx_aes, inlen, &cur_session->nc_off,
                                    cur_session->rand, cur_session->stb, inbuf, outbuf);
    if (ret != 0) {
        ESP_LOGE(TAG, "Failed at mbedtls_aes_crypt_ctr with error code : %d", ret);
        return ESP_FAIL;
    }
    return ESP_OK;
}

ESP_ERR_INVALID_ARG = 0x102 = 258

I try also with the original ESP-IDF Android App and all is ok.

After selecting the following error is coming. Mobile I use is ONEPLUS 6 PLUS, VS code, OS is MAC

Which version of flutter you are using. I am able to scan BLE devices only once, If I select provisioning second time no device is visible.

Adding logs for your reference.

esp_prov.log

[xandros6]

Finally, I found a problem.
The problem is the MTU that for Android si as default to 23, so the maximum bytes arrived is 20.
This is the problem for the session creation (41 bytes are needed).
My workaround is to request a specific MTU (512), changing line 40 on transport_ble.dart:

await peripheral.connect(requestMtu: 512);

Now all works!

[jerry2501]

Hi,
This is brilliant library to use.

But I am facing same problem which @iotechbugs was facing earlier.

I also tried to run example app and Wifi screen is not appearing and getting same error as @iotechbugs got earlier.

[jerry2501]

Please help me out with it !!

[sklimovski]

Same issue @iotechbugs faced. Any update?

[MurtuzaSrashtaSoft]

same issue