aws_iot: failed! mbedtls_ssl_handshake returned -0x6800 (IDFGH-6259) (CA-169)

[MaazSk]

Environment

• Development Kit: [ESP32-Wrover-Kit]
• Kit version (for WroverKit/PicoKit/DevKitC): [v1]
• Module or chip used: [ESP32-WROOM-32]
• IDF version (run git describe --tags to find it): v4.3
• Build System: [Make|CMake|idf.py]
• Compiler version xtensa-esp32-elf-gcc (crosstool-NG esp-2021r1) 8.4.0 -Operating System: Linux -Using an IDE : VS Code. -Power Supply: USB

Problem Description

When I am trying to connect to AWS IOT server I am getting errors for a handshake as below

aws_iot: failed! mbedtls_ssl_handshake returned -0x6800. I get this error when I am using the GSM module to connect the AWS server. But when I connect using WiFi I don't get these errors and it connects smoothly.

The logs which I receive are as follows:

I (23399) aws_iot: Shadow Connect I (26109) mbedtls: ssl_tls.c:8209 => handshake

I (26109) mbedtls: ssl_cli.c:3787 client state: 0

I (26109) mbedtls: ssl_tls.c:2850 => flush output

I (26109) mbedtls: ssl_tls.c:2862 <= flush output

I (26119) mbedtls: ssl_cli.c:3787 client state: 1

I (26129) mbedtls: ssl_tls.c:2850 => flush output

I (26129) mbedtls: ssl_tls.c:2862 <= flush output

I (26139) mbedtls: ssl_cli.c:805 => write client hello

I (26149) mbedtls: ssl_tls.c:3289 => write handshake message

I (26149) mbedtls: ssl_tls.c:3448 => write record

I (26159) mbedtls: ssl_tls.c:2850 => flush output

I (26159) mbedtls: ssl_tls.c:2869 message length: 275, out_left: 275

I (26169) mbedtls: ssl_tls.c:2874 ssl->f_send() returned 275 (-0xfffffeed)

I (26179) mbedtls: ssl_tls.c:2902 <= flush output

I (26179) mbedtls: ssl_tls.c:3581 <= write record

I (26189) mbedtls: ssl_tls.c:3425 <= write handshake message

I (26189) mbedtls: ssl_cli.c:1255 <= write client hello

I (26199) mbedtls: ssl_cli.c:3787 client state: 2

I (26199) mbedtls: ssl_tls.c:2850 => flush output

I (26209) mbedtls: ssl_tls.c:2862 <= flush output

I (26219) mbedtls: ssl_cli.c:1684 => parse server hello

I (26219) mbedtls: ssl_tls.c:4422 => read record

I (26229) mbedtls: ssl_tls.c:2631 => fetch input

I (26229) mbedtls: ssl_tls.c:2792 in_left: 0, nb_want: 5

I (31239) mbedtls: ssl_tls.c:2816 in_left: 0, nb_want: 5

I (31239) mbedtls: ssl_tls.c:2817 ssl->f_recv(_timeout)() returned -26624 (-0x6800)

W (31239) mbedtls: ssl_tls.c:5084 mbedtls_ssl_fetch_input() returned -26624 (-0x6800)

W (31249) mbedtls: ssl_tls.c:4455 ssl_get_next_record() returned -26624 (-0x6800)

W (31259) mbedtls: ssl_cli.c:1691 mbedtls_ssl_read_record() returned -26624 (-0x6800)

I (31269) mbedtls: ssl_tls.c:8219 <= handshake

E (31269) aws_iot: failed! mbedtls_ssl_handshake returned -0x6800 I (31279) mbedtls: ssl_tls.c:8854 => write close notify

I (31279) mbedtls: ssl_tls.c:8870 <= write close notify

I (31289) mbedtls: ssl_tls.c:9063 => free

I (31289) mbedtls: ssl_tls.c:9128 <= free

E (31299) aws_iot: Shadow Connection Error

[chegewara]

https://tls.mbed.org/api/ssl_8h.html#a2fdb240812860402a1a946eae8264148

[MaazSk]

@chegewara Thank you!

Can we change the timeout parameters in the code?

[shahpiyushv]

@MaazSk , the various timeouts can be found here: https://github.com/espressif/esp-aws-iot/blob/249c573cbdcf653c03a6bf3a30f658f005856880/port/network_mbedtls_wrapper.c#L42

However, are you sure that the Internet connectivity on 4G is already sorted?

[MaazSk]

Thank you @shahpiyushv, Sorry for the delay in response.

However, are you sure that the Internet connectivity on 4G is already sorted?

My internet connectivity is of 2G, I am using a 2G GSM module.

Thanks for the link I already found it yesterday and still working on it