After updating: esp-tls: mbedtls_ssl_handshake returned -0x4c about esp-azure

[nrmka]

Hi @cheezum , I have the same issue. Which branch in esp-idf do you stay at? At the latest master I get this error. Otherwise, release/v3.3 or v3.2 works fine for me. I tried to investigate the problem and stopped somewhere at the socket level:

getsockopt(fd, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);

returns zero (the newest version) instead EAGAIN (release version), so the program stops to wait/try-again-to-read response from the server and fails handshake.

[cheezum]

I'm using the master (v4.0-dev-1434).
I'll try to revert and let you know what happened.

UPDATE: My code won't compile anymore on v3.3. I probably changed too much. I'll try another older v4.0 dev version.

[chhajedji]

try compiling on v3.3 only as support for any release of v4.0 is not yet added. For reference you can check this. Generally these steps solves many issues

[cheezum]

Does it mean I have to revert back to 'make' instead of CMake?
It was pretty much a pain to switch to CMake and I don't want to go back to Make.
Now when I try to build (with CMake) on v3.3 with the latest esp-azure it gives me a lot of missing header files.

[chhajedji]

Support for CMake is not added yet. It will be added in future versions. So currently you will have to use make only.

[cheezum]

Yes I did.
My folder structure is like this:
~/esp
~/esp/Interface2/
~/esp/esp-idf/
~/esp/esp-idf/components/
~/esp/esp-idf/components/esp-azure

To fetch the v3.3 I did:
git clone --single-branch --branch release/v3.3 https://github.com/espressif/esp-idf.git --recursive
After that I cloned the esp-azure into components/
~/esp/esp-idf/components > git clone --recursive https://github.com/espressif/esp-azure

After cloning, I need to copy the CMakelists.txt file from esp-azure/port to esp-azure/ and modify it to:

set (AZURE_IOT_SDK "${CMAKE_CURRENT_LIST_DIR}/azure-iot-sdk-c")

set (COMPONENT_ADD_INCLUDEDIRS
"port/inc"
"${AZURE_IOT_SDK}/certs"
"${AZURE_IOT_SDK}/c-utility/inc"
"${AZURE_IOT_SDK}/c-utility/inc/azure_c_shared_utility"
"${AZURE_IOT_SDK}/c-utility/pal/inc"
"${AZURE_IOT_SDK}/c-utility/pal/freertos"
"${AZURE_IOT_SDK}/c-utility/pal/generic"
"${AZURE_IOT_SDK}/iothub_client/inc"
"${AZURE_IOT_SDK}/serializer/inc"
"${AZURE_IOT_SDK}/umqtt/inc"
"${AZURE_IOT_SDK}/umqtt/inc/azure_umqtt_c"
"${AZURE_IOT_SDK}/deps/parson"
"${AZURE_IOT_SDK}/provisioning_client/inc"
"${AZURE_IOT_SDK}/provisioning_client/adapters"
"${AZURE_IOT_SDK}/provisioning_client/deps/utpm/inc"
)

set (COMPONENT_SRCS
"port/src/agenttime_esp.c"
"port/src/platform_esp.c"
"port/src/tlsio_esp_tls.c"
"${AZURE_IOT_SDK}/certs/certs.c"
"${AZURE_IOT_SDK}/c-utility/pal/freertos/lock.c"
"${AZURE_IOT_SDK}/c-utility/pal/dns_async.c"

Here, I removed the ../ from the CMAKE_CURRENT_LIST line and place port/ in front of the src and inc folder.

After this I try to compile but then the compiler is unable to find nvs_flash.h, nvs.h and iothub_client.h.
The files are all referenced by custom code (~/esp/Interface2/main/helpers/)

The examples from both ESP-IDF and ESP-AZURE do compile.