I am using arduino nano and AI-Thinker SX1278 RF RA-02 lora module.
This is my code-
//#include <EEPROM.h>
//#include <Arduino.h>
#include <SPI.h>
//#include <ESP8266WiFi.h>
#include <RHRouter.h>
#include <RHMesh.h>
#include <RH_RF95.h>
//#define RH_HAVE_HARDWARE_SPI
#define RH_HAVE_SERIAL
#define LED 13
#define N_NODES 4
uint8_t nodeId;
uint8_t routes[N_NODES]; // full routing table for mesh
int16_t rssi[N_NODES]; // signal strength info
#define RFM95_CS 10
#define RFM95_RST 9
#define RFM95_INT 2
// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS,RFM95_INT);
// Class to manage message delivery and receipt, using the driver declared above
RHMesh *manager;
// message buffer
char buf[RH_MESH_MAX_MESSAGE_LEN];
/*int freeMem() {
extern int __heap_start, __brkval;
int v;
return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}/
void setup() {
randomSeed(analogRead(A0));
//pinMode(9, OUTPUT);
// digitalWrite(9, HIGH);
pinMode(RFM95_RST, OUTPUT);
digitalWrite(RFM95_RST, HIGH);
pinMode(LED, OUTPUT);
Serial.begin(115200);
while (!Serial) ; // Wait for serial port to be available
Serial.println("program is going to execute");
//nodeId = EEPROM.read(0);
nodeId = 1;
if (nodeId > 10) {
Serial.print(F("EEPROM nodeId invalid: "));
Serial.println(nodeId);
nodeId = 1;
}
Serial.print(F("initializing node "));
delay(1000);
manager = new RHMesh(rf95, nodeId);
digitalWrite(RFM95_RST, LOW);
delay(10);
digitalWrite(RFM95_RST, HIGH);
delay(10);
if (!manager->init()) {
//if (!rf95.init()) {
Serial.println(F("init failed"));
} else {
Serial.println("init successful");
}
rf95.setTxPower(23, false);
rf95.setFrequency(433.0);
//rf95.setCADTimeout(500);
////////////////////////////////////////////////////
if (!rf95.setFrequency(433.0)) {
Serial.println("setFrequency failed");
while (1);
}
else{
Serial.println("Set frequency successful");
}
///////////////////////////////////////////////////////
// Possible configurations:
// Bw125Cr45Sf128 (the chip default)
// Bw500Cr45Sf128
// Bw31_25Cr48Sf512
// Bw125Cr48Sf4096
// long range configuration requires for on-air time
boolean longRange = false;
if (longRange) {
RH_RF95::ModemConfig modem_config = {
0x78, // Reg 0x1D: BW=125kHz, Coding=4/8, Header=explicit
0xC4, // Reg 0x1E: Spread=4096chips/symbol, CRC=enable
0x08 // Reg 0x26: LowDataRate=On, Agc=Off. 0x0C is LowDataRate=ON, ACG=ON
};
rf95.setModemRegisters(&modem_config);
if (!rf95.setModemConfig(RH_RF95::Bw125Cr45Sf128)) {
Serial.println(F("set config failed"));
}
}
Serial.println("RF95 ready");
for(uint8_t n=1;n<=N_NODES;n++) {
routes[n-1] = 0;
rssi[n-1] = 0;
}
}
const __FlashStringHelper* getErrorString(uint8_t error) {
switch(error) {
case 1: return F("invalid length");
break;
case 2: return F("no route");
break;
case 3: return F("timeout");
break;
case 4: return F("no reply");
break;
case 5: return F("unable to deliver");
break;
}
return F("unknown");
}
void updateRoutingTable() {
for(uint8_t n=1;n<=N_NODES;n++) {
RHRouter::RoutingTableEntry *route = manager->getRouteTo(n);
if (n == nodeId) {
routes[n-1] = 255; // self
} else {
routes[n-1] = route->next_hop;
if (routes[n-1] == 0) {
// if we have no route to the node, reset the received signal strength
rssi[n-1] = 0;
}
}
}
}
// Create a JSON string with the routing info to each node
void getRouteInfoString(char *p, size_t len) {
p[0] = '\0';
strcat(p, "[");
for(uint8_t n=1;n<=N_NODES;n++) {
strcat(p, "{"n":");
sprintf(p+strlen(p), "%d", routes[n-1]);
strcat(p, ",");
strcat(p, ""r":");
sprintf(p+strlen(p), "%d", rssi[n-1]);
strcat(p, "}");
if (n<N_NODES) {
strcat(p, ",");
}
}
strcat(p, "]");
}
void printNodeInfo(uint8_t node, char *s) {
Serial.print(F("node: "));
Serial.print(F("{"));
Serial.print(F("""));
Serial.print(node);
Serial.print(F("""));
Serial.print(F(": "));
Serial.print(s);
Serial.println(F("}"));
}
void loop() {
for(uint8_t n=1;n<=N_NODES;n++) {
if (n == nodeId) continue; // self
updateRoutingTable();
getRouteInfoString(buf, RH_MESH_MAX_MESSAGE_LEN);
Serial.print(F("->"));
Serial.print(n);
Serial.print(F(" :"));
Serial.print(buf);
// send an acknowledged message to the target node
uint8_t error = manager->sendtoWait((uint8_t *)buf, strlen(buf), n);
if (error != RH_ROUTER_ERROR_NONE) {
Serial.println();
Serial.print(F(" ! "));
Serial.println(getErrorString(error));
} else {
Serial.println(F(" OK"));
// we received an acknowledgement from the next hop for the node we tried to send to.
RHRouter::RoutingTableEntry *route = manager->getRouteTo(n);
if (route->next_hop != 0) {
rssi[route->next_hop-1] = rf95.lastRssi();
}
}
if (nodeId == 1) printNodeInfo(nodeId, buf); // debugging
// listen for incoming messages. Wait a random amount of time before we transmit
// again to the next node
unsigned long nextTransmit = millis() + random(3000, 5000);
while (nextTransmit > millis()) {
int waitTime = nextTransmit - millis();
uint8_t len = sizeof(buf);
uint8_t from;
if (manager->recvfromAckTimeout((uint8_t *)buf, &len, waitTime, &from)) {
buf[len] = '\0'; // null terminate string
Serial.print(from);
Serial.print(F("->"));
Serial.print(F(" :"));
Serial.println(buf);
if (nodeId == 1) printNodeInfo(from, buf); // debugging
// we received data from node 'from', but it may have actually come from an intermediate node
RHRouter::RoutingTableEntry *route = manager->getRouteTo(from);
if (route->next_hop != 0) {
rssi[route->next_hop-1] = rf95.lastRssi();
}
}
}
}
}
This is OUTPUT-
program is going to execute
initializing node init successful
Set frequency successful
RF95 ready
->2 :[{"n":255,"r":0},{"n":0,"r":0},{"n":0,"r":0},{"n":0,"r":0}]
! no route
node: {"1": [{"n":255,"r":0},{"n":0,"r":0},{"n":0,"r":0},{"n":0,"r":0}]}
->3 :[{"n":255,"r":0},{"n":0,"r":0},{"n":0,"r":0},{"n":0,"r":0}]
The problem is that I am not getting noe no. and rsi values of the nodes. I am using 4 nodes. Please help and thanks in advance.
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