iOS Bluetooth Accessory maximum speed?

Question

I'm developing an external device, this device has a large amount of data to be sent via Bluetooth to the iphone / ipad, but sends a very slow speed is only about 60kbps.

The device sends data to the PC speed is 256kbps, I think not because of device problems. Who knows the iOS Bluetooth maximum speed is?

Information: Use external accessory framework, Bluetooth 2.0 + EDR

Thanks,

Answer 1

I know this is a bit late, but based on all the work I've been doing, the iDevice's are generally slower than PC/Android over Bluetooth. This is due to internal restrictions of the device, but also depending on how you're doing your data transfer (packet sizes, frequencies, latencies, packet overhead, buffer sizes, etc...), that could slow you down as well.

Another issue is that depending on the BT module you're using, I've seen HUGE variations (factor of 10) in how much data they can pass to iOS devices (even though they can all push to Androids at 300kbps).

When communicating with an iOS device, there is some additional overhead during packet handling and the protocols used, and if the BT firmware developer doesn't handle this correctly, you'll see performance implications. These numbers also change device to device and iOS version to iOS version.

To give you some concrete numbers, with one of my BT modules, here were my results (the highest I've seen so far):
iPad Mini running iOS 7.0.4 - 18,500-20,500 bytes/s
iPhone 5S running iOS 7.0.4 - 14,000-15,000 bytes/s
iPod Touch running iOS 7.0.4 - 16,000-17 000 bytes/s
iPod Touch running iOS 6.1.3 - 19,000-20,000 bytes/s

The last test there shows you that the iOS version itself can also have a large impact. Note, these were all done with the same BT module, 3-4 runs per test.

Edit: I added a bit more context here: http://www.sureshjoshi.com/embedded/bluetooth-classic-apple-french/