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I needed to send encrypted messages between two Arduino devices and I decided to use the RYLR998. It’s a powerful device and easy to integrate/program.
Anybody can modify the code and send whatever message is required. For the tutorial purpose, I’m sending just numbers.
Check the video on youtube and download the code for both devices from this page.
/*
* RYLR998 Encrypted Transmit
* December 31st 2022
* Carlo Stramaglia
* https://www.youtube.com/c/CarloStramaglia
* To change the Password, change the 8 digits in the below function LoRa.print("AT+CPIN=11223344\r\n");
* You need to have the same password on both Receiver and Transmitter
*/
#include <SoftwareSerial.h>
#include "OneButton.h"
SoftwareSerial LoRa(6, 5); // First (6) connected to TX of RYLR998, Second (5) to RX of RYLR998
#define PIN_INPUT 2
#define PIN_LED 13
OneButton button(PIN_INPUT, true);
int ledState = HIGH;
String msg = "";
int waiting = 200;
int i=0, j=0;
char messageNumber[10] = "";
void setup() {
pinMode(PIN_LED, OUTPUT);
digitalWrite(PIN_LED, ledState);
button.attachDoubleClick(doubleClick);
button.attachClick(Click);
LoRa.begin(57600);
set_AT_commands ("51","18");
delay(2000);
LoRa.print("AT+BAND=868100000\r\n"); // Placed this command because sometimes the board was going back to US standard
delay(2000);
}
void loop() {
button.tick();
i=i+1;
if (i>300) {
j=j+1;
sprintf (messageNumber, "@%i$",j);
send_AT_message("50", messageNumber);
i=0;
}
delay(10);
}
void get_serial_data(){
if (LoRa.available()){
msg = LoRa.readString();
}
}
void set_AT_commands(String address, String network_ID){
LoRa.print("AT\r\n"); // Just a check if the module is well connected
delay(waiting);
LoRa.print("AT+ADDRESS=" + address + "\r\n"); // Device Address will be stored in Flash
delay(waiting);
LoRa.print("AT+NETWORKID="+network_ID+"\r\n"); // Network ID will be stored in flash
delay(waiting);
LoRa.print("AT+PARAMETER=9,7,1,12\r\n"); // Default data. Can be deleted
delay(waiting);
LoRa.print("AT+IPR=57600\r\n"); // Lower serial speed. My Arduino was not working properly at 115200
delay(waiting);
LoRa.print("AT+RESET\r\n"); // Reset is required otherwise seems not to work properly at startup
delay(waiting);
LoRa.print("AT+BAND=868100000\r\n"); // Eurpean Bandwdth
delay(waiting);
LoRa.print("AT+CPIN=11223344\r\n"); // Encrypted password should be the same as the receiver
delay(waiting);
}
void send_AT_message(String address, char* textmessage){
int Lenght=0;
Lenght = strlen (textmessage);
LoRa.print("AT+SEND=" + address + "," + Lenght + "," + textmessage + "\r\n");
delay(waiting);
}
void doubleClick()
{
ledState = LOW;
digitalWrite(PIN_LED, ledState);
LoRa.print("AT+CPIN=12345678\r\n"); // Change Password
// LoRa.print("AT+BAND=868100000\r\n");
}
void Click()
{
ledState = HIGH;
digitalWrite(PIN_LED, ledState);
LoRa.print("AT+CPIN=11223344\r\n"); // Put back the Password
// LoRa.print("AT+BAND=868100000\r\n");
}
/*
* RYLR998 Encrypted Receiver December 31st 2022
* Carlo Stramaglia
* https://www.youtube.com/c/CarloStramaglia
* To change the Password, change the 8 digits in the below function LoRa.print("AT+CPIN=11223344\r\n");
* You need to have the same password on both Receiver and Transmitter
*/
#include <SoftwareSerial.h>
#include <U8g2lib.h>
U8G2_SSD1306_128X32_UNIVISION_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); // Adafruit Feather ESP8266/32u4 Boards + FeatherWing OLED
SoftwareSerial LoRa(6, 5); // RX, TX
//String incomingstring;
String msg = "", received_msg = "";
int waiting = 200;
void setup() {
LoRa.begin(57600);
u8g2.begin();
set_AT_commands ("50","18");
msg="";
u8g2.clearBuffer(); // clear the internal memory
u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
u8g2.drawStr(0,10,"Ready to Receive"); // write something to the internal memory
u8g2.sendBuffer(); // transfer internal memory to the display
}
void loop() {
delay (50);
get_serial_data();
if(msg != ""){
int delimiter_1, delimiter_2;
delimiter_1 = msg.indexOf("@");
delimiter_2 = msg.indexOf("$", delimiter_1 + 1);
received_msg = msg.substring(delimiter_1 + 1, delimiter_2);
int str_len = received_msg.length() + 1;
char messageLocal[str_len];
received_msg.toCharArray(messageLocal, str_len);
u8g2.clearBuffer(); // clear the internal memory
u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
u8g2.drawStr(0,10,"Receiving..."); // write something to the internal memory
u8g2.drawStr(0,25,messageLocal); // write something to the internal memory
u8g2.sendBuffer(); // transfer internal memory to the display
}
}
void get_serial_data(){
if (LoRa.available()){
msg = LoRa.readString();
}
}
void set_AT_commands(String address, String network_ID){
LoRa.print("AT\r\n"); // Just a check if the module is well connected
delay(waiting);
LoRa.print("AT+ADDRESS=" + address + "\r\n"); // Device Address will be stored in Flash
delay(waiting);
LoRa.print("AT+NETWORKID="+network_ID+"\r\n"); // Network ID will be stored in flash
delay(waiting);
LoRa.print("AT+PARAMETER=9,7,1,12\r\n"); // Default data. Can be deleted
delay(waiting);
LoRa.print("AT+IPR=57600\r\n"); // Lower serial speed. My Arduino was not working properly at 115200
delay(waiting);
LoRa.print("AT+RESET\r\n"); // Reset is required otherwise seems not to work properly at startup
delay(waiting);
LoRa.print("AT+BAND=868100000\r\n"); // Eurpean Bandwdth
delay(waiting);
LoRa.print("AT+CPIN=11223344\r\n"); // Encrypted password should be the same as the receiver
delay(waiting);
}
Setup code for LoRa module
ArduinoThis code has to be loaded once on both transmitters and receivers. This code modifies the baud rate of the serial connection from 115.200 to 57.600. Check the video.
/*
* DO THIS ONLY ONCE ON BOTH RECEIVER AND TRANSMITTER
* RYLR998 Setup code for 57600 baud communication
* December 31st 2022
* Carlo Stramaglia
* https://www.youtube.com/c/CarloStramaglia
*
*/
#include <SoftwareSerial.h>
SoftwareSerial LoRa(6, 5); // First (6) connected to TX of RYLR998, Second (5) to RX of RYLR998
String msg = "";
int waiting = 200;
int i=0, j=0;
char messageNumber[10] = "";
void setup() {
LoRa.begin(115200);
set_AT_commands ("100","18");
delay(5000);
}
void loop() {
}
void get_serial_data(){
if (LoRa.available()){
msg = LoRa.readString();
}
}
void set_AT_commands(String address, String network_ID){
LoRa.print("AT\r\n"); // Just a check if the module is well connected
delay(waiting);
LoRa.print("AT+ADDRESS=" + address + "\r\n"); // Device Address will be stored in Flash
delay(waiting);
LoRa.print("AT+NETWORKID="+network_ID+"\r\n"); // Network ID will be stored in flash
delay(waiting);
LoRa.print("AT+PARAMETER=9,7,1,12\r\n"); // Default data. Can be deleted
delay(waiting);
LoRa.print("AT+IPR=57600\r\n"); // Lower serial speed. My Arduino was not working properly at 115200
delay(waiting);
LoRa.print("AT+RESET\r\n"); // Reset is required otherwise seems not to work properly at startup
delay(waiting);
LoRa.print("AT+BAND=868100000\r\n"); // Eurpean Bandwdth
delay(waiting);
}
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