I follow this instruction and I can record the sound and write as WAV file to SD and put it on another machine to playback (sort of), except one problem - that I think it may have nothing to do with ESP32 and just general question. sph0645 is connected with i2s initialization. so I read buf with: i2...

Found the issue - it is just the message syntax - it uses JSON format and if the syntax is not correct, it does not work. if you are on the root node, it will show "parse error"

I have an internal mqtt server that receives all mesh messages from all nodes on the root node, I put some lines so i see it is subscribing topics: I (13052) [MESH_MQTT, 241]: =============== mymesh/b4e62db8661d/toDevice subscribed ============================== I (13060) [MESH_MQTT, 246]: =========...

Using the example in esp-mdf mqtt, the publish topic works fine but when you try to subscribe a topic, the payload does not come to the mesh, the root node seems no knowledge about there is a topic it subscribed, e.g. "mesh/ffffffffffff/toDevice" topic but none of the mesh node receives anything?

Apparently in testing example i2s adc_dac, there is a default music (sound like from a movie, something like "please stand by"), about 5-6 seconds, when you connect GPIO 25/26 for the speakers. Is that from factory default? I am all confused where it comes from. Even if you re-flash, it will play.