Thanks, that was helpful. It looks like my problem is more about channel selection on my mesh network.

Two questions: first, I am sending a small (12 byte) struct from one ESP32 to another, and returning an ack. The exchange frequently fails. The esp_now_send() never fails, and always returns ESP_OK. However, the send callback returns failure most of the time. When I check the status in the callback,...

A development board manufacturer included the attached diagram of the ESP32 module. I'm confused as to the relationship between GPIO and IO. Why would GPIOs be mapped to completely arbitrary pins? If I want to connect a CAN transceiver, can I simply #define CAN_RX_PIN GPIO_NUM_26 and connect the mod...

When I'm using an ESP32 devkit plugged into USB, I get 5V to power an MCP2515 SPI CAN bus shield. However, in "production" I will be using an ESP32 board running from a 12V CAN bus, so I only have 12V and 3.3V. What's the simplest way to get the 5V necessary for the MCP2515 (which will not work at 3...

I switched back to transceivers with termination resistors, changed power to the transceivers to 3.3V, connected the transceiver grounds to each other, and confirmed all my pins were correct. I also disconnected DI from GPIO 17 on the receiver side. Same result.

I have two ESP32 development boards connected using RS485 MAX serial transceivers. Following other threads in this forum, I configured one as a sender and one as a receiver. They seem to be communicating but the data is gibberish. I'm sending ints starting at 65 which should show up as ASCII 'A', bu...

Hello,
I'm having the same problem. I tried 5k and 2k resistors between SCL/SDA and +3.3V and that didn't change anything. Any recommendations?
Thanks.
William