Potencial SPI interface bootleneck
Defaul timer is set to 500 ms in IqrfDpa transaction. It is in some cases insufficient to get confirmation from coordinator. If there is more buffered DPA transaction then previous transaction expires without the confirmation message. However it is delivered later and interfere with actual transaction. There is nadr, pnum, pcmd check so it is correctly refused but in this case both transaction fail.
It may be problem of existing SPI implementation in clibspi/IqrfSpi and ti shall be more tested mainly for performance
Edited by Frantisek Mikulu