I insert the following in P2P sample // APS_DataIndication function: 


uint8_t  str[150];

...

snprintf(str, sizeof(str), "\r\nReceived cmdType=%i, cmdVal1=%i, cmdVal2=%i, cmdVal3=%i, cmdVal4=%i\r\n",
(uint8_t)  appMessage->cmdType, appMessage->cmdVal1, appMessage->cmdVal2, appMessage->cmdVal3, appMessage->cmdVal4);

sendDataToUsart((uint8_t*)str, strlen(str)+1);