A device and method transmits a data block over a wireless coexistence interface (WCI) pathway. The method includes generating a data block for transmission between a cellular chip and an Industrial, Scientific, and Medical (ISM) chip. The method includes converting the data block into messages, the messages having a format corresponding to the WCI pathway, the WCI pathway directly communicatively connecting the cellular chip and the ISM chip, the format including an indication of a message type. The method includes transmitting the messages over the WCI pathway. The method includes generating the data block based upon a concatenation of the messages.