This is based on what I see, today, in ESP32 -> master (latest) -> API Reference -> Peripherals API -> Inter-Integrated Circuit (I2C) -> Functional Overview -> Register Event Callbacks -> I2C master callbacks. Says: i2c_master_event_callbacks_t::on_recv_done sets a callback function for master "tran...

In i2c_device_config_t, I enable ACK checking through 'uint32_t disable_ack_check' which says: "Disable ACK check. If this is set false, that means ack check is enabled, the transaction will be stoped[sic] and API returns error when nack is detected ." But for 'esp_err_t i2c_master_transmit(...)' it...