Source code https://github.com/espressif/esp-mdf
release/v1.0 of esp-mdf @ 51a070c
esp-mdf master @ e0acefd, which references esp-idf @ bf02206
I have been using several ESP32 development boards and they are exhibiting the same behavior and this may just be a configuration issue.
I am using a Mosquitto MQTT broker with no authentication over TCP on an Ubuntu 20.04 desktop system for ESP32 compilation.
I reference the MQTT broker by IP address 192.168.4.115:1883 instead of a DNS name.
I have a dedicated access point going through a hub that I can sniff all WLAN network traffic for these experiments.
When I compile and run the esp-mdf/esp-idf/examples/protocols/mqtt/tcp/ example, everything works as expected using esp-mdf master. I see the following traffic:
However, as soon as I try to use the ESP-MDF MWIFI MQTT example at esp-mdf/examples/function_demo/mwifi/mqtt_example, I am able to have my ESP32 devices mesh but I am unable to have the root node's MQTT or DNS requests reach the WLAN. I have tried the following variations in the config: mqtt://192.168.4.115, mqtt://18.104.22.168:1883, and also leaving the default mqtt://iot.eclipse.org value.
This happened on both the master branch of esp-mdf referenced as well as the release/1.0 branch referenced.
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From release/v1.0 of esp-mdf 51a070c I (111619) [mdf_mem, 129]: Memory record, num: 4, size: 3116 E (115224) MQTT_CLIENT: Error transport connect D (115224) [mesh_mqtt, 216]: MQTT_EVENT_ERROR D (115224) [mesh_mqtt, 178]: MQTT_EVENT_DISCONNECTED I (115228) [mqtt_examples, 236]: event_loop_cb, event: 24578
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esp-mdf master e0acefd I (131603) [mdf_mem, 129]: Memory record, num: 4, size: 3120 E (131750) TRANS_TCP: DNS lookup failed err=202 res=0x0 E (131751) MQTT_CLIENT: Error transport connect D (131751) [mesh_mqtt, 216]: MQTT_EVENT_ERROR D (131755) [mesh_mqtt, 178]: MQTT_EVENT_DISCONNECTED
I played around with the esp_mqtt_client_config_t by directly specifying the host/port instead of the URL with the same results.
In the end, this does not appear to me as a MQTT issue but more of an LWIP or similar configuration issue. I have tried this with the defaults other than the example config settings so I'm hoping that someone has some things that I can test and hopefully get a successful network connection on my WLAN.
Thank you in advance for your help!