feat(rtsp): Clean up RTSP code (improve JPEG header impl) and expose to xplat python and c++ library; Add python examples using espp.RtspClient and espp.RtspServer

[finger563]

Description

• Update rtsp component so that it can be bound with pybind11 and used from python - this required changing some of the internal JPEG APIs to use std::span instead of std::string_view
• Add a converter for pybind11 to convert std::span to / from python lists (using std::vector)
• Add constructors for espp::Task to make it easier to use / wrap from within python - since python cannot use the std::mutex / std::condition_variable callback signatures
• Add new python examples for espp::RtspClient and espp::RtspServer
• Update existing python examples to match updated APIs

Motivation and Context

• More RTSP example code is always useful
• I want to be able to stream my desktop to my little devices (such as the mini-computer BYTE90)
• I want more jpeg-agnostic support (less hard-coded to timer cam output), so that it supports other jpeg encoders and sources

How has this been tested?

• Build and run changed code within camera-streamer example
• Build and run changed code within camera-display example
• Build the shared library lib/
• Run the new python examples

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

RTSP Client (espp/camera-display updated with this code):

rtsp-display-screen.mp4

RTSP Client (Python):

RTSP Server (Python):

Timer and Task (Python):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.

[github-actions]

✅Static analysis result - no issues found! ✅

[Copilot]

Pull Request Overview

This PR refactors the RTSP component to support Python bindings by transitioning internal JPEG APIs from std::string_view to std::span<const uint8_t>, implements a new span caster for pybind11, and adds comprehensive Python examples for both RTSP client and server functionality.

• Migrated JPEG-related APIs from std::string_view to std::span<const uint8_t> for better type safety
• Added Python bindings for RTSP classes with span converter support
• Updated existing Python examples to use simplified Task constructor patterns

Reviewed Changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lib/python_bindings/span_caster.h	Implements pybind11 type converters for std::span to/from Python types
lib/python_bindings/pybind_espp.cpp	Adds Python bindings for RTSP classes and updates constructor patterns
python/rtsp_server.py	New RTSP server example with display/webcam capture and mDNS advertising
python/rtsp_client.py	New RTSP client example with mDNS discovery and OpenCV display
components/task/include/task.hpp	Adds convenience constructors for Task class
components/socket/	Adds std::span overloads for TCP/UDP socket transmit methods
components/rtsp/	Refactors JPEG APIs to use std::span instead of std::string_view

Comments suppressed due to low confidence (1)