This profile is compatible with iPhone 5s and later.
Message Access Profile allows devices to exchange messages. It's used to receive incoming message notifications on connected vehicles. iOS and iPadOS support these MAP functions on connected vehicles:
- Receive incoming message notifications
- Reply to incoming messages
- Compose new messages
- Browse message inbox
- Mark messages as read"
The documentation talks about "connected vehicles", but can totally be implemented by any Bluetooth accessory.
If you can produce a working proof of concept for sending sms or iMessages from a third party Bluetooth device with MAP on current iOS, I’ll follow you anywhere captain.
From Apple's docs: https://support.apple.com/en-us/102842
"Message Access Profile (MAP 1.4)
This profile is compatible with iPhone 5s and later.
Message Access Profile allows devices to exchange messages. It's used to receive incoming message notifications on connected vehicles. iOS and iPadOS support these MAP functions on connected vehicles:
- Receive incoming message notifications
- Reply to incoming messages
- Compose new messages
- Browse message inbox
- Mark messages as read"
The documentation talks about "connected vehicles", but can totally be implemented by any Bluetooth accessory.