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Support both Nano bootloaders for flashing over WiFi

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- Uploader sends 'FLASH <baud>' first; the ESP32 restarts the Nano and
  bridges at that baud rate, then answers OK
- --baud=auto (default) tries 57600 (old ATmegaBOOT) then 115200 (Optiboot)
- Optional nano_reset GPIO (NPN to Nano RESET) pulses reset after power
  on, needed for Optiboot which skips the bootloader after a power cycle
- Clear errors for outdated ESP32 firmware and missing wires
- README: bootloader table, reset wire, troubleshooting

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mangavalkandClaude Opus 5.5 committed 2026-10-13 00:44:35 +02:00
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commit cefb76c1ad
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platformio.ini
+3 -1
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@@ -41,11 +41,13 @@ monitor_port = COM10
; Same Nano firmware, flashed over WiFi through the ESP32 (see README.md).
; Needs the Nano TX -> ESP32 GPIO 16 wire. upload_port = ESP32 IP[:port], default port 2323.
; --baud: bootloader baud rate. auto tries 57600 (old bootloader), then 115200 (Optiboot).
[env:nano_ota]
extends = env:nano
upload_protocol = custom
upload_port = 10.1.1.198
upload_command = "$PYTHONEXE" "$PROJECT_DIR/tools/nano_net_upload.py" "$SOURCE" $UPLOAD_PORT
upload_flags = --baud=auto
upload_command = "$PYTHONEXE" "$PROJECT_DIR/tools/nano_net_upload.py" "$SOURCE" $UPLOAD_PORT $UPLOAD_FLAGS
; ---------------------------------------------------------------------------
; ESP32 - controller, talks to the Nano over serial