Merge pull request #649 from UncleGrumpy/esp32_tools_idf5

Update esp32 `flash.sh` tool for IDF 5.x compatibility

The esptool.py resides in a different in ESP-IDF v5.x than it does in v4.x, and
it can also be installed independantly from ESP-IDF. This updates the `flash.sh`
tool to use whichever esptool.py is active in the users path. This is prepended
to the `PATH` when the IDF is activated using `. ./export.sh`, so it will work
with both major versions. This also allows the user to flash the most recent
build again without having to first activate the ESP-IDF, if they have
esptool.py installed independantly, which is quite likely as it simplifies
working with rebar3.

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

tools/dev/flash.sh

@@ -36,7 +36,7 @@ echo "%%"
 echo "%% Flashing ${1} (size=${filesize}k)"
 echo "%%"
 
-exec "${IDF_PATH}/components/esptool_py/esptool/esptool.py" \
+exec `which esptool.py` \
     --chip auto \
     --port "${FLASH_SERIAL_PORT}" \
     --baud "${FLASH_BAUD_RATE}" \