feat(espnow): Add PHY configuration for ESP-NOW packets

[lucasssvaz]

Description of Change

This pull request enhances the ESP-NOW library by introducing support for configuring and managing the PHY rate for individual peers, improving logging, and adding error handling for peer management operations. The changes ensure that rate configuration can be set per peer before initialization and are applied correctly when ESP-NOW starts or when peers are added.

PHY Rate Configuration Enhancements

• Added ability to set and get PHY rate configuration for each peer via new setRate() and getRate() methods in ESP_NOW_Peer, and included a default rate configuration macro (DEFAULT_ESPNOW_RATE_CONFIG). [1] [2] [3] [4] [5]
• Modified peer creation and addition logic to accept and use rate configuration, ensuring the correct rate is set when a peer is added and when ESP-NOW is started. [1] [2] [3] [4]
• Implemented _esp_now_set_all_peers_rate() to apply rate configuration to all peers after ESP-NOW initialization.

Improved Logging and Error Handling

• Enhanced log messages for peer addition, removal, and error cases, making debugging and peer management more transparent. [1] [2] [3]
• Added error logs when ESP-NOW is not initialized for relevant operations, improving feedback for incorrect usage. [1] [2] [3]

API Documentation and Usability

• Clarified usage in header comments and added documentation for new rate configuration methods, making the API easier to use and understand for developers. [1] [2]

These changes collectively improve the flexibility, reliability, and maintainability of the ESP-NOW library, especially for applications requiring custom PHY rate settings per peer.

Test Scenarios

Tested locally

[github-actions]

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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32C5	0	‼️ +2K	0.00	⚠️ +0.23	0	⚠️ +16	0.00	⚠️ +0.03
ESP32S3	0	⚠️ +2028	0.00	⚠️ +0.23	0	⚠️ +16	0.00	⚠️ +0.04
ESP32S2	0	⚠️ +2028	0.00	⚠️ +0.24	0	⚠️ +16	0.00	⚠️ +0.04
ESP32C3	0	‼️ +2K	0.00	⚠️ +0.24	0	⚠️ +16	0.00	⚠️ +0.05
ESP32C6	0	‼️ +2K	0.00	⚠️ +0.24	0	⚠️ +16	0.00	⚠️ +0.04
ESP32	0	‼️ +2K	0.00	⚠️ +0.23	0	⚠️ +16	0.00	⚠️ +0.04

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32C5		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
libraries/ESP_NOW/examples/ESP_NOW_Broadcast_Master	‼️ +2K	⚠️ +16	⚠️ +1992	⚠️ +16	⚠️ +2000	⚠️ +16	‼️ +2K	⚠️ +16	‼️ +2K	⚠️ +16	‼️ +2K	0
libraries/ESP_NOW/examples/ESP_NOW_Broadcast_Slave	‼️ +2K	0	⚠️ +1992	0	⚠️ +2016	0	‼️ +2K	0	‼️ +2K	0	‼️ +2K	0
libraries/ESP_NOW/examples/ESP_NOW_Network	‼️ +2K	0	⚠️ +1980	0	⚠️ +1976	0	‼️ +2K	0	‼️ +2K	⚠️ +16	‼️ +2K	⚠️ +16
libraries/ESP_NOW/examples/ESP_NOW_Serial	‼️ +2K	⚠️ +16	⚠️ +2028	⚠️ +16	⚠️ +2028	⚠️ +16	‼️ +2K	⚠️ +16	‼️ +2K	⚠️ +16	‼️ +2K	⚠️ +16

[github-actions]

Test Results

 83 files   83 suites   26m 49s ⏱️
 55 tests  55 ✅ 0 💤 0 ❌
598 runs  598 ✅ 0 💤 0 ❌

Results for commit 0f9035a.

♻️ This comment has been updated with latest results.