Hi everyone,
Using a Lora 433Mhz (grove) transceiver I'm looking for reading my pellet stove temperature sensor.
I figured out I had to sniff the signal first to be able to understand how it's made.
The idea here is to trigger my ceiling fan when the temperature rises of a certain value.
Apparently the temperature sensor is supposed to send datas to the stove continuously but I doubt about it as I only received 8 packet over the night.
This morning I reset the sniffer and received 3 packets. The second and Third look uncomplete (isAck / PacketLen / PacketContents are missing). The first one is displaying a Packet content but it's unreadable.
(!)I have to say I'm not even sure this packets come from the Temp Sensor(!)
Rx Count~Rx@millis~LastRSSI~FromAddr~ToAddr~MsgId~HdrFlags~isAck~PacketLen~PacketContents
0 ~31560 ~16 ~ -88~ 70~ 208~ f4~ ~2296 ~⸮⸮⸮⸮⸮⸮⸮⸮
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Rx Count~Rx@millis~LastRSSI~FromAddr~ToAddr~MsgId~HdrFlags~isAck~PacketLen~PacketContents
1 ~ 5681~ 19~ -88~ 79~ 145~ da~
2 ~ -7914~ 34~ -88~ 166~ 71~ fa~
I have to say I had to look for quite a lot to find a sniffing code that "works" for me and I'm not 100% it fits my needs / hardware. This one may have been developed for another platfom (feather?)
Could you advise on what would be the next step for me to :
1- Ensure the sniffer is properly working and receiving everything it can.
2- Decode the Packet Content to read the temperature value.
// MIT License
// Copyright 2017 LooUQ Incorportated.
// Many thanks to Adafruit and AirSpayce.
/* Example sketch to capture all packets on a LoRa (RF95) radio network and send them to the
* serial port for monitoring or debugging a LoRa network.
*
* Output MODE can be verbose or delimited
* - verbose sends output as readable text output with each field labeled
* - delimited sends output as a compressed text string, delimited by a char of your choice
* Delimited is intended to be captured to a file on the serial host and displayed in an application
* such as Excel or OpenOffice
*/
enum OutputMode { verbose, delimited };
/* Define your desired output format here */
OutputMode mode = delimited;
#define DELIMETER_CHAR '~'
/* end output format defintion */
#include <SPI.h>
#include <RH_RF95.h>
#include <stdio.h>
#define RH_FLAGS_ACK 0x80
/* for feather32u4
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 7
*/
/* for feather m0 */
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 3
/* for shield
#define RFM95_CS 10
#define RFM95_RST 9
#define RFM95_INT 7
*/
/* Feather 32u4 w/wing
#define RFM95_RST 11 // "A"
#define RFM95_CS 10 // "B"
#define RFM95_INT 2 // "SDA" (only SDA/SCL/RX/TX have IRQ!)
*/
/* Feather m0 w/wing
#define RFM95_RST 11 // "A"
#define RFM95_CS 10 // "B"
#define RFM95_INT 6 // "D"
*/
/* Teensy 3.x w/wing
#define RFM95_RST 9 // "A"
#define RFM95_CS 10 // "B"
#define RFM95_INT 4 // "C"
*/
// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 434.0
// Singleton instance of the radio driver
//RH_RF95 rf95(RFM95_CS, RFM95_INT);
SoftwareSerial ss(5, 6);
RH_RF95 rf95(ss);
// Blink LED on packet receipt (Adafruit M0 here)
#define LED 13
int16_t rxCount = 0; // packet counter
uint8_t rxBuffer[RH_RF95_MAX_MESSAGE_LEN]; // receive buffer
uint8_t rxRecvLen; // number of bytes actually received
char printBuffer[512] = "\0"; // to send output to the PC
char formatString[] = {"%d~%d~%d~%d~%d~%d~%2x~%s~%d~%s"};
char legendString[] = "Rx Count~Rx@millis~LastRSSI~FromAddr~ToAddr~MsgId~HdrFlags~isAck~PacketLen~PacketContents";
void setup()
{
pinMode(LED, OUTPUT);
pinMode(RFM95_RST, OUTPUT);
digitalWrite(RFM95_RST, HIGH);
while (!Serial);
Serial.begin(9600);
delay(100);
Serial.print("Feather LoRa Network Probe [Mode=");
Serial.print(mode == verbose ? "verbose" : "delimeted");
Serial.println("]");
// manual reset
digitalWrite(RFM95_RST, LOW);
delay(10);
digitalWrite(RFM95_RST, HIGH);
delay(10);
while (!rf95.init()) {
Serial.println("LoRa radio init failed");
while (1);
}
Serial.println("LoRa radio init OK!");
if (!rf95.setFrequency(RF95_FREQ)) { // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
Serial.println("setFrequency failed");
while (1); // if can't set frequency, we are cooked!
}
Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
// Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
// need to setPromiscuous(true) to receive all frames
rf95.setPromiscuous(true);
// set delimeter
if (mode == delimited) {
if (DELIMETER_CHAR != '~') {
for (int i = 0; i < sizeof(formatString); i++)
{
if (formatString[i] == '~')
formatString[i] = DELIMETER_CHAR;
}
for (int i = 0; i < sizeof(legendString); i++)
{
if (legendString[i] == '~')
legendString[i] = DELIMETER_CHAR;
}
}
Serial.println(legendString);
}
}
void loop()
{
// wait for a lora packet
rxRecvLen = sizeof(rxBuffer); // RadioHead expects max buffer, will update to received bytes
digitalWrite(LED, LOW);
if (rf95.available())
{
digitalWrite(LED, HIGH);
if (rf95.recv(rxBuffer, &rxRecvLen))
{
char isAck[4] = {""};
if (rf95.headerFlags() & RH_FLAGS_ACK)
memcpy(isAck, "Ack\0", 3);
rxBuffer[rxRecvLen] = '\0';
if (mode == delimited)
{
snprintf(printBuffer, sizeof(printBuffer), formatString, rxCount++, millis(), rf95.lastRssi(), rf95.headerFrom(), rf95.headerTo(), rf95.headerId(), rf95.headerFlags(), isAck, rxRecvLen, rxBuffer);
Serial.println(printBuffer);
}
else
{
snprintf(printBuffer, sizeof(printBuffer), "Recv#:%d @ %d, Signal(RSSI)= %d", rxCount++, millis(), rf95.lastRssi());
Serial.println(printBuffer);
snprintf(printBuffer, sizeof(printBuffer), " From: %d >> To: %d MsgId: %d Flags: %2x %s", rf95.headerFrom(), rf95.headerTo(), rf95.headerId(), rf95.headerFlags(), isAck);
Serial.println(printBuffer);
snprintf(printBuffer, sizeof(printBuffer), "Bytes: %d => %s \r\n", rxRecvLen, rxBuffer);
Serial.println(printBuffer);
}
}
}
}
