Hi prognars,
Im having the same problem with my app.. I would like to send packets in the most efficient way possible. First of all and after 3 years could find a solution ? I was wondering to have a readable characteristic in the peripheral with the value of doing central.maximumUpdateValueLength, and from the central I will be able to have both MTUS, the central one by reading that characteristic from the peripheral and the peripherals by doing peripheral.maximumWriteValueLengthForType. This way my MTU will be the smallest value