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Are you ready to play with Do-It-Yourself Alexa Speaker, WiFi SIP phone, WiFi walkie-talkie, Internet Radio player and broadcasting? Then the Open Source hardware ESP32-ADF is the right board to start with!
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GitHub - SmartWalkieOrg/VoicePing-Walkie-Talkie-AndroidSDK: VoicePing Android SDK - Walkie Talkie/Push-To-Talk Android SDK for your Chat Apps
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