I am using a pair of Adafruit Feather M0 boards with an RFM9x LORA radio on each. I have installed the RadioHead rf95_reliable_datagram sketches on my boards and they will communicate back and forth with each other with the stock sketches.
I want to be able to send a different byte array from the client to the server depending upon the state of a switch. The end goal is to turn a device at the server end off or on.
So I have tried to modify the client code to transmit a message depending upon the switch status but I never see the message change when I open or close the switch. I added debug print statements to my if(switch) code and I can see that the switch changes are actually being read but the message being sent does not change. I watch what the server has received to see if the message changes.
In the code below you can see that I declare and initialize the byte array
uint8_t data[11] = "Arduino";
In the main program loop. I then try to change the contents of the array in my if(switch) code.
if(switch_state == 0) {
uint8_t data[11] = ("Switch Off");
Serial.println("Switch Off");
}
else {
uint8_t data[11] = ("Switch On ");
Serial.println("Switch On");
}
No mater what I do I always see the "Arduino" text being received at the server. It seems like the byte is a constant instead of a variable? Any ideas or help would be greatly appreciated. Thanks in advance.
// rf95_reliable_datagram_client.ino
// -*- mode: C++ -*-
// Example sketch showing how to create a simple addressed, reliable messaging client
// with the RHReliableDatagram class, using the RH_RF95 driver to control a RF95 radio.
// It is designed to work with the other example rf95_reliable_datagram_server
// Tested with Anarduino MiniWirelessLoRa, Rocket Scream Mini Ultra Pro with the RFM95W
#if defined(ARDUINO_SAMD_ZERO) && defined(SERIAL_PORT_USBVIRTUAL)
// Required for Serial on Zero based boards
#define Serial SERIAL_PORT_USBVIRTUAL
#endif
#include <SPI.h>
#include <RHReliableDatagram.h>
#include <RH_RF95.h>
#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2
// Singleton instance of the radio driver
RH_RF95 driver(8,3); //AdaFruit Feather M0 with the RFM95W
// Class to manage message delivery and receipt, using the driver declared above
RHReliableDatagram manager(driver, CLIENT_ADDRESS);
unsigned short int switch_state;
void setup()
{
pinMode(13, OUTPUT); // Make LED pin an output
digitalWrite(13, LOW); // Start with LED OFF
pinMode(10, INPUT_PULLUP);
Serial.begin(9600);
// while (!Serial) ; // Wait for serial port to be available
if (!manager.init())
Serial.println("init failed");
// Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
driver.setFrequency(915.0);
// The default transmitter power is 13dBm, using PA_BOOST.
// If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
// you can set transmitter powers from 5 to 23 dBm:
driver.setTxPower(13, false);
// You can optionally require this module to wait until Channel Activity
// Detection shows no activity on the channel before transmitting by setting
// the CAD timeout to non-zero:
// driver.setCADTimeout(10000);
}
void loop()
{
digitalWrite(13, HIGH); // LED ON
delay(1000);
Serial.println("* Sending to rf95_reliable_datagram_server *");
switch_state = digitalRead(10);
uint8_t data[11] = "Arduino";
if(switch_state == 0) {
uint8_t data[11] = ("Switch Off");
Serial.println("Switch Off");
}
else {
uint8_t data[11] = ("Switch On ");
Serial.println("Switch On");
}
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN]; // Dont put this on the stack:
if (manager.sendtoWait(data, sizeof(data), SERVER_ADDRESS)) // Send a message to manager_server
{
// 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);
digitalWrite(13, LOW); // LED OFF
}
else
{
Serial.println("No reply, is rf95_reliable_datagram_server running?");
}
}
else
Serial.println("sendtoWait failed");
delay(500);
}
