我尝试解析从LoRa LoRa.readString()发送的一些传感器数据。

Question

我需要在LoRa接收器中解析从LoRa发送器收到的消息。打印序列中的所有字符串例如："29.56,1004,20“没有任何问题，但我无法解析数组中的"String LoRaData = MQTT ()；”，以便将它们作为单独的数据发送，您可以在LoRa.readString屏幕上使用它们来发送它们。

我的实际代码是：

#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>  
#include "SSD1306.h" 
#include "images.h"

#define SCK     5    // GPIO5  -- SX1278's SCK
#define MISO    19   // GPIO19 -- SX1278's MISO
#define MOSI    27   // GPIO27 -- SX1278's MOSI
#define SS      18   // GPIO18 -- SX1278's CS
#define RST     14   // GPIO14 -- SX1278's RESET
#define DI0     26   // GPIO26 -- SX1278's IRQ(Interrupt Request)
#define BAND    868E6

SSD1306 display(0x3c, 4, 15);
String rssi = "RSSI --";
String packSize = "--";
String packet ;

void logo(){
  display.clear();
  display.display();
}

void loraData(){
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.setFont(ArialMT_Plain_24);
  display.drawString(0 , 15 , "Received "+ packSize + " bytes");
  display.drawStringMaxWidth(0 , 26 , 128, packet);
  display.drawString(0, 0, rssi);  
  display.display();
  }

void cbk(int packetSize) {
  packet ="";
  packSize = String(packetSize,DEC);
  for (int i = 0; i < packetSize; i++) { packet += (char) LoRa.read(); 
  }
  rssi = "RSSI " + String(LoRa.packetRssi(), DEC) ;
  loraData();
}

void setup() {
  pinMode(16,OUTPUT);
  pinMode(2,OUTPUT);
  digitalWrite(16, LOW);    // set GPIO16 low to reset OLED
  delay(50); 
  digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 in high

  Serial.begin(9600);
  while (!Serial);
  Serial.println();
  Serial.println("LoRa Receiver Callback");
  SPI.begin(SCK,MISO,MOSI,SS);
  LoRa.setPins(SS,RST,DI0);  
  if (!LoRa.begin(868E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  //LoRa.onReceive(cbk);
  LoRa.receive();
  Serial.println("init ok");
  display.init();
  display.flipScreenVertically();  
  display.setFont(ArialMT_Plain_16);
  delay(1500);
}

void loop() {
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);

  // try to parse packet
  int packetSize = LoRa.parsePacket();
if (packetSize) {
  // received a packet
  Serial.print("Recived packet '");

  // read packet
  while (LoRa.available()) {
  String LoRaData = LoRa.readString();
  Serial.print(LoRaData); 
  display.drawString(0, 0,  "Reciving.... ");
  display.drawString(0, 20, "message: ");
  display.drawString(0, 40, String(LoRaData));
  display.display();
  delay(1500);
}

// print RSSI of packet

  Serial.print("' with RSSI ");
  Serial.println(LoRa.packetRssi());
  String packetRssi_to_send = String(LoRa.packetRssi());
  display.clear();
  display.drawString(0, 0,  "Sinial Quality ");
  display.drawString(0, 40, "Rssi = ");
  display.drawString(50, 40, String(packetRssi_to_send));
  display.display();
  delay(1500);
  }
}

Answer 1

我怀疑LoRa.readString()应用程序接口有问题。我改变了：

String LoRaData = LoRa.readString();

至

LoRaData = LoRaData+(char)LoRa.read();

示例：

// wait for LoRa packet
int packetSize = LoRa.parsePacket();
if (packetSize)
{
Serial.println("Paquet recu ");
String LoRaData ="";
while (LoRa.available()) 
{ // tant que le paquet LoRa arrive
LoRaData = LoRaData+(char)LoRa.read();
}