sendtoWait error with rf95_reliable_datagram_server using ELEGOO Uno R3 and RFM9x LoRa Radio

Projects Programming
1

Hello all,

I'm attempting my first LoRa radio client/server and, while the basic Adafruit radio example works fine (it's not a server, just sends a message), the RadioHead client example I modified does not. I've not included a wiring diagram with this post because the radio initializes just fine and the adafruit example works as well. However, I keep getting the "sendtoWait failed" error from the last else statement with this code.

I'm quite new to coding, any help would be appreciated.

Code:

#include <RHReliableDatagram.h>
#include <RH_RF95.h>
#include <SPI.h>

#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2
#define RFM95_CS 4
#define RFM95_RST 2
#define RFM95_INT 3

// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 915.0

// Singleton instance of the radio driver
RH_RF95 driver(RFM95_CS, RFM95_INT);

// Class to manage message delivery and receipt, using the driver declared above
RHReliableDatagram manager(driver, CLIENT_ADDRESS);

void setup() {

  Serial.begin(9600);
  while (!Serial)
    ;  // Wait for serial port to be available
  if (!manager.init())
    Serial.println("init failed");
  if (manager.init())
    Serial.println("init succeeded");

  Serial.print("Set Freq to: ");
  Serial.println(RF95_FREQ);
  driver.setTxPower(23, false);
}

uint8_t data[] = "Hello World!";
// Dont put this on the stack:
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];

void loop() {
  delay(1000);
  Serial.println("Sending to rf95_reliable_datagram_server");

  if (manager.sendtoWait(data, sizeof(data), SERVER_ADDRESS)) {
    // Now wait for a reply from the server
    uint8_t len = sizeof(buf);
    uint8_t from;
    if (manager.recvfromAckTimeout(buf, &len, 2000, &from)) {
      Serial.print("got reply from : 0x");
      Serial.print(from, HEX);
      Serial.print(": ");
      Serial.println((char*)buf);
    } else {
      Serial.println("No reply, is rf95_reliable_datagram_server running?");
    }
  } else
    Serial.println("sendtoWait failed");
  delay(500);
}
2

Despite printing that you're going to set the Frequency, you don't actually do it.

4

Thanks for the input. Fixed this with:

driver.setFrequency(RF95_FREQ);

Unfortunately, no change to the sendtoWait error.