926d5ee6ad
The otatool pytest calls dut.serial.close() and then immediately launches otatool_example.py as a subprocess that re-opens the same serial port via esptool. This fails intermittently because: 1. pytest-embedded's QueueFeederThread still holds a reference to the serial port file descriptor when close() returns, causing 'argument must be an int, or have a fileno() method' error. 2. The OS has not fully released the serial port by the time the subprocess tries to open it. Add a delay after serial close and retry logic for the subprocess to handle transient serial port contention. Made-with: Cursor
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-H21 | ESP32-H4 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
|---|
OTA Tool Example
This example demonstrates common operations the OTA tool otatool.py allows the user to perform:
- reading, writing and erasing OTA partitions,
- switching boot partitions, and
- switching to factory partition.
Users taking a look at this example should focus on the contents of the Python script otatool_example.py or shell script otatool_example.sh. The scripts contain programmatic invocation of the tool's functions via the Python API and command-line interface, respectively. Note that on Windows, the shell script example requires a POSIX-compatible environment via MSYS2/Git Bash/WSL etc.
The built application in this example outputs the currently running partition, whose output is used to verify if the tool switched OTA partitions successfully. The built application binary is written to all OTA partitions at the start of the example to be able to determine the running partition for all switches performed.
How to use example
Build and Flash
Before running either of the example scripts, it is necessary to build and flash the firmware using the usual means:
idf.py build flash
Running otatool_example.py
The example can be executed by running the script otatool_example.py or otatool_example.sh.
Python script:
python otatool_example.py
Shell script:
./otatool_example.sh
The script searches for valid target devices connected to the host and performs the operations on the first one it finds. This could present problems if there are multiple viable target devices attached to the host. To perform the operations on a specific device, specify the port it is attached to during script invocation ("/dev/ttyUSB2" for example):
Python script:
python otatool_example.py --port /dev/ttyUSB2
Shell script:
./otatool_example.sh /dev/ttyUSB2
Example output
Running the script produces the following output:
Writing factory firmware to ota_0
Writing factory firmware to ota_1
Switching to factory app
Switching to OTA slot 0
Switching to OTA slot 1 (twice in a row)
Switching to OTA slot 0 (twice in a row)
Switching to factory app
Switching to OTA slot 1
Partition tool operations performed successfully