Alexis

I will try that as soon as i have an Iphone where i can install lightblue (at the moment i borrowed one and cannot install things - my own will...

Does this mean, that the characteristic is somehow not correct in repect to iOS principles?

We use an Seeeduino Wio Lite MG126 microcontroller and Arduino ide for implementing. Since i did not write the code, i have to understand it and find the correct lines...

Thank you, i will try it :)

I cannot fix this :/ Do you have any other idea?

The full file is now: /// Characteristic Properties Bit #define ATT_CHAR_PROP_RD 0x02 #define ATT_CHAR_PROP_W_NORSP 0x04 #define ATT_CHAR_PROP_W 0x08 #define ATT_CHAR_PROP_NTF 0x10 #define ATT_CHAR_PROP_IND 0x20 #define GATT_PRIMARY_SERVICE_UUID 0x2800 #define TYPE_PRESENTATION_FORMAT 0x2904...

Some progress: the characteristic can be found now after changing the handles many times :) But now the peripheral disconnects shortly after writing the value on both platforms. LightBlue gives...