从iOS应用到蓝牙音箱播放实时声音

I have to build an iOS app for one of my client. The concept is If I blow into the iPhone mic, the sound could be come from the blue tooth speaker. For example If I say "Hi" in the mic, the app should pass that audio to the Bluetooth speaker and sound should comes from the blue tooth speaker. Till now I have done the Bluetooth pairing . I have been searching for this since last 3 days but couldn't find any solution. Please let me know any suggestions or links to start the app. I have to build an iOS app for one of my client