CayenneLPP

This is an Arduino Library that implements a version of the Cayenne Low Power Payload for my use in low power radios like the RFM69 radio communication. It is NOT intended for TTN (or Cayenne for that matter). It varies in that there is one "channel" per payload, in my case, the "node id." It also adds the "Voltage" format.

It encodes. It decodes to JSON via ArduinoJson.

Documentation

See code and examples.

##Examples

• Encode

CayenneLPP lpp(NODEID);

lpp.reset();
lpp.addVoltage(3.028);
lpp.addTemperature(73.2);
lpp.addBarometricPressure(1073.21);
uint8_t len = lpp.getSize();
uint8_t *buff = (uint8_t *)malloc(len);
lpp.copy(buff);
  
// e.g. send it somewhere
radio.sendWithRetry(GATEWAYID, buff, len, 1);
  
free(buff);

• Decode

CayenneLPPDecode lppd;

StaticJsonBuffer<200> jsonBuffer;
JsonObject& root = jsonBuffer.createObject();

// e.g. "you know you can't live without your radio"
lppd.write((uint8_t*)radio.DATA, radio.DATALEN);
lppd.decode(root);
root["rssi"] = radio.RSSI;

Serial.print(radio.NODEID);
root.printTo(Serial);
Serial.println();
lppd.reset();

##Credits

• Cayenne Low Power Payload
• Based on the work of Johan Stokking
• Luiz Henrique Cassettari (decode stuff)