How can I establish a BLE connection between my iPhone and an Arduino device to control AirPods?
Establishing BLE contact with Arduinos is one matter. Controlling AirPods (whatever that is) is another matter.
Try Google on "Arduino + BLE + phone".
Try the same for "Arduino + Your AP".
Last suggestion is to read and use this link: How to get the best out of this forum - Using Arduino / IDE 1.x - Arduino Forum
Assuming the AirPods are connected to the iPhone and are set as the current sound output
say you are successful in establishing a BLE connection between your iPhone and a suitable "Arduino" (with BLE). Can you confirm your question is "how can the arduino" take control of the AirPods like stop/pause?"
if that's you question, then the answer is you can't with just this pairing.
You would actually need to write an application running on the iPhone that takes command from the Arduino over BLE and control a music player instance in your app and initiate the player and relay commands like play and then pause/stop.
alternatively you could use the standard Bluetooth profiles for audio control. There are two common profiles for this, the Hands-Free Profile (HFP) and the Audio/Video Remote Control Profile (AVRCP). These profiles allow for basic control of audio playback without requiring custom code on the iPhone
In both cases It won't specifically control your airPods - just the media player...
if that's not what you have in mind, then provide more details for what you want to achieve...
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