Master Control Panel vs iOS

[Konstantin]

Hi guys,

I have designed a custom board with nrf51822. Data transfer seems OK, when I do it through Master Control Panel - I can write data to characteristics and I can read it. But when I try to read or to write data via iPad or iPhone it doesn't do it. Maybe someone knows what is the problem?

Regards, Konstantin

[wlgrd]

What data format are you using? You should be able to break in the debugger on the receiving handler and see if you are receiving a valid value. This could be endianness or more commonly the size of the packet (8 bit/16 bit). Could you post your connection parameters? According to Apple design guidelines, p18, https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf, iDevices require specific connection parameters, which may also cause an issue.

[Konstantin]

I can write correct data from nrf51822 to iOS but I can't write data from iOS to nrf51822 :(

[wlgrd]

So your connection parameters are good then. In what format are the data you're trying to send from iOS?

[Konstantin]

Oh, now it is OK. It was iOS developers' mistake. They were writing data withoutResponse.

[wlgrd]

Well, writing without response does still write to the peripheral. Just remember that this could slow things down a bit if you are transferring data at short intervals. Glad you figured it out