diff --git a/firmware/libcommon/source/sniffer.c b/firmware/libcommon/source/sniffer.c
index c2b8725..2ad435c 100644
--- a/firmware/libcommon/source/sniffer.c
+++ b/firmware/libcommon/source/sniffer.c
@@ -91,6 +91,7 @@
 	PPS_S_WAIT_PPS2, /*!< second parameter byte */
 	PPS_S_WAIT_PPS3, /*!< third parameter byte */
 	PPS_S_WAIT_PCK, /*!< check byte */
+	PPS_S_WAIT_END, /*!< all done */
 };
 
 /*! Transport Protocol Data Unit (TPDU) sub-states of ISO7816_S_IN_TPDU
@@ -265,9 +266,10 @@
 }
 
 /*! Send current ATR over USB
- *  @note Also print the ATR over serial
+ *  @param[in] complete if the ATR is complete
+ *  @note Also print the ATR to debug console
  */
-static void usb_send_atr(void)
+static void usb_send_atr(bool complete)
 {
 	/* Check state */
 	if (ISO7816_S_IN_ATR!=iso_state) {
@@ -283,7 +285,7 @@
 	led_blink(LED_GREEN, BLINK_2O_F);
 
 	/* Print ATR */
-	printf("ATR: ");
+	printf("ATR%s: ", complete ? "" : " (incomplete)");
 	uint8_t i;
 	for (i = 0; i < atr_i; i++) {
 		printf("%02x ", atr[i]);
@@ -296,7 +298,7 @@
 		return;
 	}
 	struct sniff_data *usb_sniff_data_atr = (struct sniff_data *) msgb_put(usb_msg, sizeof(*usb_sniff_data_atr));
-	usb_sniff_data_atr->complete = true;
+	usb_sniff_data_atr->complete = complete;
 	usb_sniff_data_atr->length = atr_i;
 	uint8_t *data = msgb_put(usb_msg, usb_sniff_data_atr->length);
 	memcpy(data, atr, atr_i);
@@ -384,7 +386,7 @@
 		}
 	case ATR_S_WAIT_TCK:  /* see ISO/IEC 7816-3:2006 section 8.2.5 */
 		/* we could verify the checksum, but we are just here to sniff */
-		usb_send_atr(); /* send ATR to host software using USB */
+		usb_send_atr(true); /* send ATR to host software using USB */
 		change_state(ISO7816_S_WAIT_TPDU); /* go to next state */
 		break;
 	default:
@@ -393,9 +395,10 @@
 }
 
 /*! Send current PPS over USB
- *  @note Also print the PPS over serial
+ *  @param[in] complete if the PPS is complete
+ *  @note Also print the PPS over the debug console
  */
-static void usb_send_pps(void)
+static void usb_send_pps(bool complete)
 {
 	uint8_t *pps_cur; /* current PPS (request or response) */
 
@@ -412,26 +415,32 @@
 	/* Get only relevant data */
 	uint8_t pps[6];
 	uint8_t pps_i = 0;
-	pps[pps_i++] = pps_cur[0];
-	pps[pps_i++] = pps_cur[1];
-	if (pps_cur[1]&0x10) {
+	if (pps_state>PPS_S_WAIT_PPSS) {
+		pps[pps_i++] = pps_cur[0];
+	}
+	if (pps_state>PPS_S_WAIT_PPS0) {
+		pps[pps_i++] = pps_cur[1];
+	}
+	if (pps_state>PPS_S_WAIT_PPS1 && pps_cur[1]&0x10) {
 		pps[pps_i++] = pps_cur[2];
 	}
-	if (pps_cur[1]&0x20) {
+	if (pps_state>PPS_S_WAIT_PPS2 && pps_cur[1]&0x20) {
 		pps[pps_i++] = pps_cur[3];
 	}
-	if (pps_cur[1]&0x40) {
+	if (pps_state>PPS_S_WAIT_PPS3 && pps_cur[1]&0x40) {
 		pps[pps_i++] = pps_cur[4];
 	}
-	pps[pps_i++] = pps_cur[5];
+	if (pps_state>PPS_S_WAIT_PCK) {
+		pps[pps_i++] = pps_cur[5];
+	}
 	
 	/* Show activity on LED */
 	led_blink(LED_GREEN, BLINK_2O_F);
 
 	/* Print PPS */
-	printf("PPS: ");
+	printf("PPS%s: ", complete ? "" : " (incomplete)");
 	uint8_t i;
-	for (i = 0; i < pps_i; i++) {
+	for (i = 0;  i < pps_i; i++) {
 		printf("%02x ", pps[i]);
 	}
 	printf("\n\r");
@@ -442,7 +451,7 @@
 		return;
 	}
 	struct sniff_data *usb_sniff_data_pps = (struct sniff_data *) msgb_put(usb_msg, sizeof(*usb_sniff_data_pps));
-	usb_sniff_data_pps->complete = true;
+	usb_sniff_data_pps->complete = complete;
 	usb_sniff_data_pps->length = pps_i;
 	uint8_t *data = msgb_put(usb_msg, usb_sniff_data_pps->length);
 	memcpy(data, pps, pps_i);
@@ -527,7 +536,8 @@
 			check ^= pps_cur[4];
 		}
 		check ^= pps_cur[5];
-		usb_send_pps(); /* send PPS to host software using USB */
+		pps_state = PPS_S_WAIT_END;
+		usb_send_pps(true); /* send PPS to host software using USB */
 		if (ISO7816_S_IN_PPS_REQ==iso_state) {
 			if (0==check) { /* checksum is valid */
 				change_state(ISO7816_S_WAIT_PPS_RSP); /* go to next state */
@@ -553,15 +563,20 @@
 			change_state(ISO7816_S_WAIT_TPDU); /* go to next state */
 		}
 		break;
+	case PPS_S_WAIT_END:
+		TRACE_WARNING("Unexpected PPS received %u\n\r", pps_state);
+		break;
 	default:
-		TRACE_INFO("Unknown PPS state %u\n\r", pps_state);
+		TRACE_WARNING("Unknown PPS state %u\n\r", pps_state);
+		break;
 	}
 }
 
 /*! Send current TPDU over USB
- *  @note Also print the TPDU over serial
+ *  @param[in] complete if the TPDU is complete
+ *  @note Also print the TPDU over the debug console
  */
-static void usb_send_tpdu(void)
+static void usb_send_tpdu(bool complete)
 {
 	/* Check state */
 	if (ISO7816_S_IN_TPDU!=iso_state) {
@@ -573,7 +588,7 @@
 	led_blink(LED_GREEN, BLINK_2O_F);
 
 	/* Print TPDU */
-	printf("TPDU: ");
+	printf("TPDU%s: ", complete ? "" : " (incomplete)");
 	uint16_t i;
 	for (i = 0; i < tpdu_packet_i && i < ARRAY_SIZE(tpdu_packet); i++) {
 		printf("%02x ", tpdu_packet[i]);
@@ -586,7 +601,7 @@
 		return;
 	}
 	struct sniff_data *usb_sniff_data_tpdu = (struct sniff_data *) msgb_put(usb_msg, sizeof(*usb_sniff_data_tpdu));
-	usb_sniff_data_tpdu->complete = true;
+	usb_sniff_data_tpdu->complete = complete;
 	usb_sniff_data_tpdu->length = tpdu_packet_i;
 	uint8_t *data = msgb_put(usb_msg, usb_sniff_data_tpdu->length);
 	memcpy(data, tpdu_packet, tpdu_packet_i);
@@ -656,7 +671,7 @@
 		break;
 	case TPDU_S_SW2:
 		tpdu_packet[tpdu_packet_i++] = byte;
-		usb_send_tpdu(); /* send TPDU to host software using USB */
+		usb_send_tpdu(true); /* send TPDU to host software using USB */
 		change_state(ISO7816_S_WAIT_TPDU); /* this is the end of the TPDU */
 		break;
 	case TPDU_S_DATA_SINGLE:
@@ -902,16 +917,16 @@
 			/* Use timeout to detect interrupted data transmission */
 			switch (iso_state) {
 			case ISO7816_S_IN_ATR:
-				//usb_send_atr(false); /* send incomplete ATR to host software using USB */
+				usb_send_atr(false); /* send incomplete ATR to host software using USB */
 				change_state(ISO7816_S_WAIT_ATR);
 				break;
 			case ISO7816_S_IN_TPDU:
-				//usb_send_tpdu(false); /* send incomplete PPS to host software using USB */
+				usb_send_tpdu(false); /* send incomplete PPS to host software using USB */
 				change_state(ISO7816_S_WAIT_TPDU);
 				break;
 			case ISO7816_S_IN_PPS_REQ:
 			case ISO7816_S_IN_PPS_RSP:
-				//usb_send_pps(false); /* send incomplete TPDU to host software using USB */
+				usb_send_pps(false); /* send incomplete TPDU to host software using USB */
 				change_state(ISO7816_S_WAIT_TPDU);
 				break;
 			default: