docs(scripting): Add example of usage as a Python module

Closes espressif#1029

Author: radimkarnis

docs/en/esptool/scripting.rst

@@ -1,7 +1,7 @@
 .. _scripting:
 
 Embedding into Custom Scripts
-=============================
+-----------------------------
 
 ``esptool.py``, ``espefuse.py``, and ``espsecure.py`` can easily be integrated into Python applications or called from other Python scripts.
 
@@ -12,3 +12,54 @@ While it currently does have a poor Python API, something which `#208 <https://g
     command = ['--baud', '460800', 'read_flash', '0', '0x200000', 'flash_contents.bin']
     print('Using command %s' % ' '.join(command))
     esptool.main(command)
+
+
+Using Esptool as a Python Module
+--------------------------------
+
+The following is an example on how to use esptool as a Python module and leverage its Python API to flash the {IDF_TARGET_NAME}:
+
+.. note::
+
+    This example code functionally equivalent to ``esptool.py -p /dev/ttyACM0 write_flash 0x10000 firmware.bin``
+
+
+.. code-block:: python
+
+    from esptool.cmds import detect_chip
+
+    # The port of the connected ESP
+    PORT = "/dev/ttyACM0"
+    # The binary file
+    BIN_FILE = "./firmware.bin"
+    # Flash offset to flash the binary to
+    FLASH_ADDRESS = 0x10000
+
+    def progress_callback(percent):
+        print(f"Wrote: {int(percent)}%")
+
+    with detect_chip(PORT) as esp:
+        description = esp.get_chip_description()
+        features = esp.get_chip_features()
+        print(f"Detected ESP on port {PORT}: {description}")
+        print(f"Features: {", ".join(features)}")
+
+        esp = esp.run_stub()
+        with open(BIN_FILE, 'rb') as binary:
+            # Load the binary
+            binary_data = binary.read()
+            total_size = len(binary_data)
+            print(f"Binary size: {total_size} bytes")
+
+            # Write binary blocks
+            esp.flash_begin(total_size, FLASH_ADDRESS)
+            for i in range(0, total_size, esp.FLASH_WRITE_SIZE):
+                block = binary_data[i:i + esp.FLASH_WRITE_SIZE]
+                # Pad the last block
+                block = block + bytes([0xFF]) * (esp.FLASH_WRITE_SIZE - len(block))
+                esp.flash_block(block, i + FLASH_ADDRESS)
+                progress_callback(float(i + len(block)) / total_size * 100)
+            esp.flash_finish()
+
+            # Reset the chip out of bootloader mode
+            esp.hard_reset()