diff --git a/src/payload.cpp b/src/payload.cpp
index 2624c138..05924897 100644
--- a/src/payload.cpp
+++ b/src/payload.cpp
@@ -491,6 +491,474 @@ void PayloadConvert::addTime(time_t value) {
 }
 #endif // PAYLOAD_ENCODER
 
+void PayloadConvert::addPM10( float value) {
+#if (HAS_SDS011)
+#if (PAYLOAD_ENCODER == 1)   // plain
+    char tempBuffer[10+1];
+    sprintf( tempBuffer, ",%5.1f", value);
+    addChars(tempBuffer, strlen(tempBuffer));
+#elif (PAYLOAD_ENCODER == 2 ) // packed
+    writeUint16( (uint16_t) (value*10) );
+#elif (PAYLOAD_ENCODER == 3 ) // Cayenne LPP dynamic
+#error not implemented yet
+#elif (PAYLOAD_ENCODER == 4 ) // Cayenne LPP packed
+#error not implemented yet
+#endif
+#endif // HAS_SDS011
+}
+
+void PayloadConvert::addPM25( float value) {
+#if (HAS_SDS011)
+#if (PAYLOAD_ENCODER == 1)   // plain
+    char tempBuffer[10+1];
+    sprintf( tempBuffer, ",%5.1f", value);
+    addChars(tempBuffer, strlen(tempBuffer));
+#elif (PAYLOAD_ENCODER == 2 ) // packed
+    writeUint16( (uint16_t) (value*10) );
+#elif (PAYLOAD_ENCODER == 3 ) // Cayenne LPP dynamic
+#error not implemented yet
+#elif (PAYLOAD_ENCODER == 4 ) // Cayenne LPP packed
+#error not implemented yet
+#endif
+#endif // HAS_SDS011
+}
+
+void PayloadConvert::addChars( char * string, int len) {
+  for (int i=0; i < len; i++)
+      addByte(string[i]);
+}
+
+  buffer[cursor++] = highByte(voltage);
+  buffer[cursor++] = lowByte(voltage);
+  buffer[cursor++] = (byte)((uptime & 0xFF00000000000000) >> 56);
+  buffer[cursor++] = (byte)((uptime & 0x00FF000000000000) >> 48);
+  buffer[cursor++] = (byte)((uptime & 0x0000FF0000000000) >> 40);
+  buffer[cursor++] = (byte)((uptime & 0x000000FF00000000) >> 32);
+  buffer[cursor++] = (byte)((uptime & 0x00000000FF000000) >> 24);
+  buffer[cursor++] = (byte)((uptime & 0x0000000000FF0000) >> 16);
+  buffer[cursor++] = (byte)((uptime & 0x000000000000FF00) >> 8);
+  buffer[cursor++] = (byte)((uptime & 0x00000000000000FF));
+  buffer[cursor++] = (byte)(cputemp);
+  buffer[cursor++] = (byte)((mem & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((mem & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((mem & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((mem & 0x000000FF));
+  buffer[cursor++] = (byte)(reset1);
+  buffer[cursor++] = (byte)(reset2);
+}
+
+void PayloadConvert::addGPS(gpsStatus_t value) {
+#if(HAS_GPS)
+  buffer[cursor++] = (byte)((value.latitude & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((value.latitude & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((value.latitude & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((value.latitude & 0x000000FF));
+  buffer[cursor++] = (byte)((value.longitude & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((value.longitude & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((value.longitude & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((value.longitude & 0x000000FF));
+#if (!PAYLOAD_OPENSENSEBOX)
+  buffer[cursor++] = value.satellites;
+  buffer[cursor++] = highByte(value.hdop);
+  buffer[cursor++] = lowByte(value.hdop);
+  buffer[cursor++] = highByte(value.altitude);
+  buffer[cursor++] = lowByte(value.altitude);
+#endif
+#endif
+}
+
+void PayloadConvert::addSensor(uint8_t buf[]) {
+#if(HAS_SENSORS)
+  uint8_t length = buf[0];
+  memcpy(buffer, buf + 1, length);
+  cursor += length; // length of buffer
+#endif
+}
+
+void PayloadConvert::addBME(bmeStatus_t value) {
+#if(HAS_BME)
+  int16_t temperature = (int16_t)(value.temperature); // float -> int
+  uint16_t humidity = (uint16_t)(value.humidity);     // float -> int
+  uint16_t pressure = (uint16_t)(value.pressure);     // float -> int
+  uint16_t iaq = (uint16_t)(value.iaq);               // float -> int
+  buffer[cursor++] = highByte(temperature);
+  buffer[cursor++] = lowByte(temperature);
+  buffer[cursor++] = highByte(pressure);
+  buffer[cursor++] = lowByte(pressure);
+  buffer[cursor++] = highByte(humidity);
+  buffer[cursor++] = lowByte(humidity);
+  buffer[cursor++] = highByte(iaq);
+  buffer[cursor++] = lowByte(iaq);
+#endif
+}
+
+void PayloadConvert::addButton(uint8_t value) {
+#ifdef HAS_BUTTON
+  buffer[cursor++] = value;
+#endif
+}
+
+void PayloadConvert::addTime(time_t value) {
+  uint32_t time = (uint32_t)value;
+  buffer[cursor++] = (byte)((time & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((time & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((time & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((time & 0x000000FF));
+}
+
+/* ---------------- packed format with LoRa serialization Encoder ----------
+ */
+// derived from
+// https://github.com/thesolarnomad/lora-serialization/blob/master/src/LoraEncoder.cpp
+
+#elif (PAYLOAD_ENCODER == 2)
+
+void PayloadConvert::addByte(uint8_t value) { writeUint8(value); }
+
+void PayloadConvert::addCount(uint16_t value, uint8_t snifftype) {
+  writeUint16(value);
+}
+
+void PayloadConvert::addAlarm(int8_t rssi, uint8_t msg) {
+  writeUint8(rssi);
+  writeUint8(msg);
+}
+
+void PayloadConvert::addVoltage(uint16_t value) { writeUint16(value); }
+
+void PayloadConvert::addConfig(configData_t value) {
+  writeUint8(value.loradr);
+  writeUint8(value.txpower);
+  writeUint16(value.rssilimit);
+  writeUint8(value.sendcycle);
+  writeUint8(value.wifichancycle);
+  writeUint8(value.blescantime);
+  writeUint8(value.rgblum);
+  writeBitmap(value.adrmode ? true : false, value.screensaver ? true : false,
+              value.screenon ? true : false, value.countermode ? true : false,
+              value.blescan ? true : false, value.wifiant ? true : false,
+              value.vendorfilter ? true : false,
+              value.monitormode ? true : false);
+  writeBitmap(value.payloadmask && GPS_DATA ? true : false,
+              value.payloadmask && ALARM_DATA ? true : false,
+              value.payloadmask && MEMS_DATA ? true : false,
+              value.payloadmask && COUNT_DATA ? true : false,
+              value.payloadmask && SENSOR1_DATA ? true : false,
+              value.payloadmask && SENSOR2_DATA ? true : false,
+              value.payloadmask && SENSOR3_DATA ? true : false,
+              value.payloadmask && BATT_DATA ? true : false);
+  writeVersion(value.version);
+}
+
+void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime, float cputemp,
+                               uint32_t mem, uint8_t reset1, uint8_t reset2) {
+  writeUint16(voltage);
+  writeUptime(uptime);
+  writeUint8((byte)cputemp);
+  writeUint32(mem);
+  writeUint8(reset1);
+  writeUint8(reset2);
+}
+
+void PayloadConvert::addGPS(gpsStatus_t value) {
+#if(HAS_GPS)
+  writeLatLng(value.latitude, value.longitude);
+#if (!PAYLOAD_OPENSENSEBOX)
+  writeUint8(value.satellites);
+  writeUint16(value.hdop);
+  writeUint16(value.altitude);
+#endif
+#endif
+}
+
+void PayloadConvert::addSensor(uint8_t buf[]) {
+#if(HAS_SENSORS)
+  uint8_t length = buf[0];
+  memcpy(buffer, buf + 1, length);
+  cursor += length; // length of buffer
+#endif
+}
+
+void PayloadConvert::addBME(bmeStatus_t value) {
+#if(HAS_BME)
+  writeFloat(value.temperature);
+  writePressure(value.pressure);
+  writeUFloat(value.humidity);
+  writeUFloat(value.iaq);
+#endif
+}
+
+void PayloadConvert::addButton(uint8_t value) {
+#ifdef HAS_BUTTON
+  writeUint8(value);
+#endif
+}
+
+void PayloadConvert::addTime(time_t value) {
+  uint32_t time = (uint32_t)value;
+  writeUint32(time);
+}
+
+void PayloadConvert::uintToBytes(uint64_t value, uint8_t byteSize) {
+  for (uint8_t x = 0; x < byteSize; x++) {
+    byte next = 0;
+    if (sizeof(value) > x) {
+      next = static_cast<byte>((value >> (x * 8)) & 0xFF);
+    }
+    buffer[cursor] = next;
+    ++cursor;
+  }
+}
+
+void PayloadConvert::writeUptime(uint64_t uptime) {
+  writeUint64(uptime);
+}
+
+void PayloadConvert::writeVersion(char *version) {
+  memcpy(buffer + cursor, version, 10);
+  cursor += 10;
+}
+
+void PayloadConvert::writeLatLng(double latitude, double longitude) {
+  // Tested to at least work with int32_t, which are processed correctly.
+  writeUint32(latitude);
+  writeUint32(longitude);
+}
+
+void PayloadConvert::writeUint64(uint64_t i) { uintToBytes(i, 8); }
+
+void PayloadConvert::writeUint32(uint32_t i) { uintToBytes(i, 4); }
+
+void PayloadConvert::writeUint16(uint16_t i) { uintToBytes(i, 2); }
+
+void PayloadConvert::writeUint8(uint8_t i) { uintToBytes(i, 1); }
+
+void PayloadConvert::writeUFloat(float value) {
+  writeUint16(value * 100);
+}
+
+void PayloadConvert::writePressure(float value) {
+  writeUint16(value * 10);
+}
+
+/**
+ * Uses a 16bit two's complement with two decimals, so the range is
+ * -327.68 to +327.67 degrees
+ */
+void PayloadConvert::writeFloat(float value) {
+  int16_t t = (int16_t)(value * 100);
+  if (value < 0) {
+    t = ~-t;
+    t = t + 1;
+  }
+  buffer[cursor++] = (byte)((t >> 8) & 0xFF);
+  buffer[cursor++] = (byte)t & 0xFF;
+}
+
+void PayloadConvert::writeBitmap(bool a, bool b, bool c, bool d, bool e, bool f,
+                                 bool g, bool h) {
+  uint8_t bitmap = 0;
+  // LSB first
+  bitmap |= (a & 1) << 7;
+  bitmap |= (b & 1) << 6;
+  bitmap |= (c & 1) << 5;
+  bitmap |= (d & 1) << 4;
+  bitmap |= (e & 1) << 3;
+  bitmap |= (f & 1) << 2;
+  bitmap |= (g & 1) << 1;
+  bitmap |= (h & 1) << 0;
+  writeUint8(bitmap);
+}
+
+/* ---------------- Cayenne LPP 2.0 format ---------- */
+// see specs
+// http://community.mydevices.com/t/cayenne-lpp-2-0/7510 (LPP 2.0)
+// https://github.com/myDevicesIoT/cayenne-docs/blob/master/docs/LORA.md
+// (LPP 1.0) PAYLOAD_ENCODER == 3 -> Dynamic Sensor Payload, using channels ->
+// FPort 1 PAYLOAD_ENCODER == 4 -> Packed Sensor Payload, not using channels ->
+// FPort 2
+
+#elif ((PAYLOAD_ENCODER == 3) || (PAYLOAD_ENCODER == 4))
+
+void PayloadConvert::addByte(uint8_t value) { 
+  /* 
+  not implemented
+  */ }
+
+void PayloadConvert::addCount(uint16_t value, uint8_t snifftype) {
+  switch (snifftype) {
+  case MAC_SNIFF_WIFI:
+#if (PAYLOAD_ENCODER == 3)
+    buffer[cursor++] = LPP_COUNT_WIFI_CHANNEL;
+#endif
+    buffer[cursor++] =
+        LPP_LUMINOSITY; // workaround since cayenne has no data type meter
+    buffer[cursor++] = highByte(value);
+    buffer[cursor++] = lowByte(value);
+    break;
+  case MAC_SNIFF_BLE:
+#if (PAYLOAD_ENCODER == 3)
+    buffer[cursor++] = LPP_COUNT_BLE_CHANNEL;
+#endif
+    buffer[cursor++] =
+        LPP_LUMINOSITY; // workaround since cayenne has no data type meter
+    buffer[cursor++] = highByte(value);
+    buffer[cursor++] = lowByte(value);
+    break;
+  }
+}
+
+void PayloadConvert::addAlarm(int8_t rssi, uint8_t msg) {
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_ALARM_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_PRESENCE;
+  buffer[cursor++] = msg;
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_MSG_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_ANALOG_INPUT;
+  buffer[cursor++] = rssi;
+}
+
+void PayloadConvert::addVoltage(uint16_t value) {
+  uint16_t volt = value / 10;
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_BATT_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_ANALOG_INPUT;
+  buffer[cursor++] = highByte(volt);
+  buffer[cursor++] = lowByte(volt);
+}
+
+void PayloadConvert::addConfig(configData_t value) {
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_ADR_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_DIGITAL_INPUT;
+  buffer[cursor++] = value.adrmode;
+}
+
+void PayloadConvert::addStatus(uint16_t voltage, uint64_t uptime, float celsius,
+                               uint32_t mem, uint8_t reset1, uint8_t reset2) {
+  uint16_t temp = celsius * 10;
+  uint16_t volt = voltage / 10;
+#if (defined BAT_MEASURE_ADC || defined HAS_PMU)
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_BATT_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_ANALOG_INPUT;
+  buffer[cursor++] = highByte(volt);
+  buffer[cursor++] = lowByte(volt);
+#endif // BAT_MEASURE_ADC
+
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_TEMPERATURE_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_TEMPERATURE;
+  buffer[cursor++] = highByte(temp);
+  buffer[cursor++] = lowByte(temp);
+}
+
+void PayloadConvert::addGPS(gpsStatus_t value) {
+#if(HAS_GPS)
+  int32_t lat = value.latitude / 100;
+  int32_t lon = value.longitude / 100;
+  int32_t alt = value.altitude * 100;
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_GPS_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_GPS;
+  buffer[cursor++] = (byte)((lat & 0xFF0000) >> 16);
+  buffer[cursor++] = (byte)((lat & 0x00FF00) >> 8);
+  buffer[cursor++] = (byte)((lat & 0x0000FF));
+  buffer[cursor++] = (byte)((lon & 0xFF0000) >> 16);
+  buffer[cursor++] = (byte)((lon & 0x00FF00) >> 8);
+  buffer[cursor++] = (byte)(lon & 0x0000FF);
+  buffer[cursor++] = (byte)((alt & 0xFF0000) >> 16);
+  buffer[cursor++] = (byte)((alt & 0x00FF00) >> 8);
+  buffer[cursor++] = (byte)(alt & 0x0000FF);
+#endif // HAS_GPS
+}
+
+void PayloadConvert::addSensor(uint8_t buf[]) {
+#if(HAS_SENSORS)
+// to come
+/*
+  uint8_t length = buf[0];
+  memcpy(buffer, buf+1, length);
+  cursor += length; // length of buffer
+*/
+#endif // HAS_SENSORS
+}
+
+void PayloadConvert::addBME(bmeStatus_t value) {
+#if(HAS_BME)
+
+  // data value conversions to meet cayenne data type definition
+  // 0.1°C per bit => -3276,7 .. +3276,7 °C
+  int16_t temperature = (int16_t)(value.temperature * 10.0);
+  // 0.1 hPa per bit => 0 .. 6553,6 hPa
+  uint16_t pressure = (uint16_t)(value.pressure * 10);
+  // 0.5% per bit => 0 .. 128 %C
+  uint8_t humidity = (uint8_t)(value.humidity * 2.0);
+  int16_t iaq = (int16_t)(value.iaq);
+
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_TEMPERATURE_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_TEMPERATURE; // 2 bytes 0.1 °C Signed MSB
+  buffer[cursor++] = highByte(temperature);
+  buffer[cursor++] = lowByte(temperature);
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_BAROMETER_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_BAROMETER; // 2 bytes 0.1 hPa Unsigned MSB
+  buffer[cursor++] = highByte(pressure);
+  buffer[cursor++] = lowByte(pressure);
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_HUMIDITY_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_HUMIDITY; // 1 byte 0.5 % Unsigned
+  buffer[cursor++] = humidity;
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_AIR_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_LUMINOSITY; // 2 bytes, 1.0 unsigned
+  buffer[cursor++] = highByte(iaq);
+  buffer[cursor++] = lowByte(iaq);
+#endif // HAS_BME
+}
+
+void PayloadConvert::addButton(uint8_t value) {
+#ifdef HAS_BUTTON
+#if (PAYLOAD_ENCODER == 3)
+  buffer[cursor++] = LPP_BUTTON_CHANNEL;
+#endif
+  buffer[cursor++] = LPP_DIGITAL_INPUT;
+  buffer[cursor++] = value;
+#endif // HAS_BUTTON
+}
+
+void PayloadConvert::addTime(time_t value) {
+#if (PAYLOAD_ENCODER == 4)
+  uint32_t t = (uint32_t)value;
+  uint32_t tx_period = (uint32_t)SENDCYCLE * 2;
+  buffer[cursor++] = 0x03; // set config mask to UTCTime + TXPeriod
+  // UTCTime in seconds
+  buffer[cursor++] = (byte)((t & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((t & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((t & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((t & 0x000000FF));
+  // TXPeriod in seconds
+  buffer[cursor++] = (byte)((tx_period & 0xFF000000) >> 24);
+  buffer[cursor++] = (byte)((tx_period & 0x00FF0000) >> 16);
+  buffer[cursor++] = (byte)((tx_period & 0x0000FF00) >> 8);
+  buffer[cursor++] = (byte)((tx_period & 0x000000FF));
+#endif
+}
+#endif // PAYLOAD_ENCODER
+
 void PayloadConvert::addPM10( float value) {
 #if (HAS_SDS011)
 #if (PAYLOAD_ENCODER == 1)   // plain