Particle xenon rf9x reliable datagram client

xenon-reliable-client.cpp

#include <Particle.h>
#include <RF9X-RK.h> //https://github.com/rickkas7/RF9X-RK

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

#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2

/*
Adafruit rf95 feather wiring:
CS->A
RST->F
IRQ->E
*/
#define RFM95_CS D3
#define RFM95_RST A5
#define RFM95_INT D2 
#define RF95_FREQ 915.0

SYSTEM_MODE(MANUAL); 
SYSTEM_THREAD(ENABLED);
// Singleton instance of the radio driver
RH_RF95 driver(D6, D2);

float frequency = 915.0;
char radiopacket[100];

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

uint32_t timer = millis();
char data[20];
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
int logRate = 5000;
byte sendLen;
 
void setup() {

    Mesh.disconnect();
    Mesh.off();  
    Particle.disconnect();  

    pinMode(RFM95_RST, OUTPUT);  
    digitalWrite(RFM95_RST, HIGH);
    
    Serial.begin(115200) ; 

    // manual reset
    digitalWrite(RFM95_RST, LOW);
    delay(10);
    digitalWrite(RFM95_RST, HIGH);
    delay(10);

	if (!manager.init())
		Serial.println("init failed");

	driver.setFrequency(frequency);

	driver.setTxPower(23, false);

}//setup


void loop()
{

    if (millis() - timer > logRate) {
        timer = millis(); // reset the timer
    
        snprintf(radiopacket, sizeof(radiopacket),"aFloat:,%1.2f",9.9); //you'd initialize data to send here

        sendLen = strlen(radiopacket);
        radiopacket[sendLen] = '\0';

        Serial.println("Sending to rf95_reliable_datagram_server");

        // Send a message to manager_server
        if (manager.sendtoWait((uint8_t*)radiopacket, sizeof(radiopacket), 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))
    		{
    			buf[len] = 0;
			    Serial.printlnf("got reply from 0x%02x rssi=%d %s", from, driver.lastRssi(), (char *) buf);
		    }
    		else
		    {
    			Serial.println("No reply, is rf95_reliable_datagram_server running?");
    		}
    	}
    	else
		    Serial.println("sendtoWait failed");
	    delay(500);
    }//if (millis() - timer > 2000) 
}//loop