Arduino ESP32 Core 3.3.7 Support

What's Changed

• ESP32 Core 3.3.7 Support
• Avoid the 'ringbuffer underflowed!' log message spam by @thegreenshark in #751
• Add peer name callback by @Zipdox2 in #760
• fix compile error if A2DP_SPP_SUPPORT=0 by @rferrazz in #763
• Enhance AVRC deinitialization process by @Shaan-rk in #762
• Fix: Implement Bidirectional Volume Sync and Prevent Feedback Loop by @GiacoBot in #765

New Contributors

• @thegreenshark made their first contribution in #751
• @Zipdox2 made their first contribution in #760
• @rferrazz made their first contribution in #763
• @Shaan-rk made their first contribution in #762
• @GiacoBot made their first contribution in #765

Full Changelog: v1.8.8...v1.8.9

September 2025

• A2DPSource: Support for end() while in discovery mode
• A2DPSink: added set_max_write_size() and set_max_write_delay_ms()
• Reconnect error: Start buedroid only once
• provided to_str(esp_bt_gap_discovery_state_t)
• A2DPNoVolumeControl: support fixed reduced volume
• Fix Warnings for IDF 5.5
• Improved platform checks
• Updated README.md

February 2025

What's Changed

• Hide obsolete get_connected_source_name() method
• Use nvs only with auto_reconnect
• Move init_nvs to common
• correct m_a2d_audio_state_str
• Add additional ESP variants to checks

January 2025

Common

• new method set_avrc_rn_event_mask()

A2DPSoruce

• Correct disconnect(), reconnect() logic
• set_avrc_passthru_command_callback() to support avrc (buttons) on the bluetooth speakers
• cleanup legacy functionality:
  • use separate setter methods to define the data callback
  • use start() w/o data callback method
  • Remove SoundData and all related functionality
  • adjusted examples for new conventions

A2DPSink

• new methods for volume_up() and volume_down()
• Support for latest AudioTools release

November 2024

• Support for idf 5.1.4
• Rename bt_music_receiver_simple example
• Added method is_discovery_active to A2DP source
• Added set_bt_discovery_mode_callback to A2DP source
• Added set_valid_cod_service and isValidAudioService() to A2DP to A2DP source
• Remove player_init status flag
• Update to latest AudioTools version (includes convention, logger)
• Corrected misspelled set_rssi_callback
• Doxygen support for external enums and typedefs

September 2024

• Support for Arduino esp32 core 3.1 / IDF 5.1.4
• Use actual FreeRTOS typedef types in code (support legacy code with defines)
• Improvments in README

July 2024

Full Changelog: v.1.8.2...v1.8.3

June 2024 - Error corrections

• Set default sample rate to 44100
• Prevent AudioTools warning for a2dp source
• correct set_output()
• config.h A2DP_I2S_AUDIOTOOLS via platformio
• Added variable timer for play pos notification, RN_TRACK_CHANGE setter (#560)
• set_avrc_rn_play_pos_callback define default interval to 10 sec
• Update is_i2s_active before deactivating i2s-
• Error message for ESP32 C6
• Support for IDF 5.2.1
• update cmake: add BluetoothA2DPOutput.cpp
• cmake prevent errors
• Linker error
• Remove dependency from Arduino API for delay and millis()
• check esp_bt_controller_init
• Fix broken btStart in Arduino
• bt_init print error codes
• Compile error with ESP 5.0
• playing status example better messages
• Arduino I2S w/o AudioTools
• Sink: provide get_output()
• new methods: set_output_active() and is_output_active()
• increase A2DP_I2S_MAX_WRITE_SIZE to 5k
• 32 bit example: clean up includes
• end(): timout A2DP_DISCONNECT_LIMIT

May 2024 Release

New Functionality

• Continue to provide Legacy examples
• A2DPSource: support of volume buttons on Bluetooth speakers
• A2DPSink: added avrc_rn_play_pos_callback method (thanks to zyphlar)

Error Corrections

• Corrections to SimpleExponentialVolumeControl and LinearVolumeControl
• Make sure that I2S is not used when it has been deactivated (is_output is set to false)

Output classes

• Redesign output and move functionality to separate classes
• 32bit example