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The Anjay-esp32-client will hit build error if disable IPV6 or DTLS.
Suggest adding below ifdef to allow build without IPV6 or DTLS.

diff --git a/main/anjay-config/avsystem/commons/avs_commons_config.h b/main/anjay-config/avsystem/commons/avs_commons_config.h
index 7d762da..004ea91 100644
--- a/main/anjay-config/avsystem/commons/avs_commons_config.h
+++ b/main/anjay-config/avsystem/commons/avs_commons_config.h
@@ -255,7 +255,9 @@
  * TinyDTLS support is only rudimentary.
  */
 /**@{*/
+#if CONFIG_MBEDTLS_SSL_PROTO_DTLS
 #define AVS_COMMONS_WITH_MBEDTLS
+#endif
 /* #undef AVS_COMMONS_WITH_OPENSSL */
 /* #undef AVS_COMMONS_WITH_TINYDTLS */
 
@@ -529,7 +531,9 @@
  * At least one of AVS_COMMONS_NET_WITH_IPV4 and AVS_COMMONS_NET_WITH_IPV6
  * MUST be defined if avs_net is enabled.
  */
+#if CONFIG_LWIP_IPV6
 #define AVS_COMMONS_NET_WITH_IPV6
+#endif
 
 /**
  * If the TLS backend is set to OpenSSL, enables support for DTLS.

When I build with esp-idf CONFIG_MBEDTLS_ROM_MD5=y, I got below redefined warnings:

[944/1039] Building C object esp-idf/main/CMakeFiles/anjay.dir/anjay/deps/avs_commons/src/stream/md5/avs_stream_mbedtls.c.obj
/home/axel/esp/lwm2m/Anjay-esp32-client/main/anjay/deps/avs_commons/src/stream/md5/avs_stream_mbedtls.c:41: warning: "mbedtls_md5_update" redefined
 #        define mbedtls_md5_update mbedtls_md5_update_ret

In file included from /home/axel/esp/esp-idf/components/mbedtls/mbedtls/include/mbedtls/md5.h:94,
                 from /home/axel/esp/lwm2m/Anjay-esp32-client/main/anjay/deps/avs_commons/src/stream/md5/avs_stream_mbedtls.c:23:
/home/axel/esp/esp-idf/components/mbedtls/port/include/md5_alt.h:34: note: this is the location of the previous definition
 #define mbedtls_md5_update                      esp_md5_update

/home/axel/esp/lwm2m/Anjay-esp32-client/main/anjay/deps/avs_commons/src/stream/md5/avs_stream_mbedtls.c:42: warning: "mbedtls_md5_finish" redefined
 #        define mbedtls_md5_finish mbedtls_md5_finish_ret

In file included from /home/axel/esp/esp-idf/components/mbedtls/mbedtls/include/mbedtls/md5.h:94,
                 from /home/axel/esp/lwm2m/Anjay-esp32-client/main/anjay/deps/avs_commons/src/stream/md5/avs_stream_mbedtls.c:23:
/home/axel/esp/esp-idf/components/mbedtls/port/include/md5_alt.h:35: note: this is the location of the previous definition
 #define mbedtls_md5_finish                      esp_md5_finish

Note, CONFIG_MBEDTLS_ROM_MD5 is default y.

I hit registration update failure when there is a temporary network interface down, the Anjay-esp32-client stop working.

Below is the error mesages I observed:
E (105533) anjay: ERROR [avs_net] [/home/axel/Anjay-esp32-client/main/anjay/deps/avs_commons/src/net/compat/posix/avs_net_impl.c:1198]: send failed
W (105544) anjay: WARNING [anjay] [/home/axel/Anjay-esp32-client/main/anjay/src/core/servers/anjay_register.c:878]: failure while receiving Update response: No route to host
E (105562) anjay: ERROR [anjay] [/home/axel/Anjay-esp32-client/main/anjay/src/core/servers/anjay_register.c:844]: could not send registration update for SSID==1: 2

It then stop working after above messages.
The point is that it does not recover after the network interface is back.
It looks like anjay_event_loop_run does not consider this as fatal error
so the application does not know how to handle such error.

Hello,
I am using the ESP32 WROVER KIT. when i try to run the command idf.py set-target esp32. from the git folder directory it gives the error CMake Error at main/CMakeLists.txt:34 (add_library):
No SOURCES given to target: anjay

the full verbose cmd line output is attached below
error message.txt

Any help would be much appreciated.

I test Anjay-esp32-client 22.01 with server uri: coaps://leshan.eclipseprojects.io:5684,
then I got below errors:

E (3866) anjay: ERROR [avs_net] [/home/axel/Anjay-esp32-client/main/anjay/deps/avs_commons/src/net/mbedtls/avs_mbedtls_socket.c:913]: PSK support disabled
E (3876) anjay: ERROR [avs_net] [/home/axel/Anjay-esp32-client/main/anjay/deps/avs_commons/src/net/mbedtls/../avs_ssl_common.h:113]: socket initialization error
E (3896) anjay: ERROR [anjay] [/home/axel/Anjay-esp32-client/main/anjay/src/core/servers/anjay_connection_ip.c:87]: could not create CoAP socket

The issue is because removing define for AVS_COMMONS_NET_WITH_PSK
cf987a2#diff-d0d7ec43c37443919998aa1b9e30f94d2ccc8bb635e683f397abd13ff4c4b23bL555
BTW, Anjay-esp32-client 22.01 added define for AVS_COMMONS_WITH_AVS_CRYPTO_PSK but seems it's not used at all.

Hello,
I followed your instructions and was able to set up the communication with the coiote IOT dashboard. Now I want to set it up with a local instance of thingsboard with PSK on port 5686 ( DTLS port of thingsboard lwm2m) but I am getting the following error on the esp32.

eager to hear from you.
thanks

Hi everyone,
I have facing the issue to use the LWM2M client in my openthread device as Application Layer.
Device Configuration :
1.) Espressif Devikit Wrover - ESP32C6
2.) Openthread Platform
3.) Lwm2m Client in Thread End Device

                I have included the anjay library to my component folder and the code is building without Error...

                The Connection for LWM2M Server in anjay_event_loop_run() getting an error as "Openthread radio buffer full"

                I have followed the AVsystem API documentation guide for Simple lwm2m client connection to server , instance and object registering get -> Done , But the Event loop connecting the Server shows an Buffer Size Full

                The Maximum Buffer Size for Openthread Radio Buffer is ->[100]