Timeout connecting, but works on adafruit version of esptool-js

[tyeth]

Board = PyPortal Titano (SAMD51 with onboard ESP32)
Uploaded the SerialNINAPassthru sketch to allow esp32 to be connected to serial port in download mode.
Connecting to serial shows esp boot message and download mode.

Connecting using esptool-js site just keeps attempting to connect and fails https://espressif.github.io/esptool-js/

Connecting using adafruit site works. https://adafruit.github.io/Adafruit_WebSerial_ESPTool/

[tyeth]

Getting a slip read error programming, going to try another pc.

[tyeth]

Kept getting slip errors on adafruit esptool (espressif esptool wouldnt even connect) writing a 1.4mb firmware until I erased another time. (Had previously erased in theory, but not sure I let it complete). Then wrote fine

Still would expect espressif esptool-js to report the connected device like the adafruit one does.

[brianignacio5]

Could you Copy the trace and share here ?