How?? Many clients using RadioHead Reliable Datagram manager on rfm69

Using Arduino Networking, Protocols, and Devices
1

Hi,
I would like one server adafruit feather rfm69 telling two clients how to operate. All the examples and projects I can find have a 1:1 setup server : client and I cannot get 1:2 to work. I think the problem is I don't understand the syntax of the reliable datagram manager.
The relevant section of the given example is below. This is the client from the Adafruit website -

#include <SPI.h>
#include <RH_RF69.h>
#include <RHReliableDatagram.h>
/************ Radio Setup ***************/

// Change to 434.0 or other frequency, must match RX's freq!
#define RF69_FREQ 868.0

// Where to send packets to!
#define DEST_ADDRESS   1
// change addresses for each client board, any number :)
#define MY_ADDRESS     2

This works out of the box for two feathers.

If I alter it to add an additional line for three feathers, only two work. I am changing the my_address for each of the three feathers and on the two clients I am changing the dest_address to point at the server. This is the server code -

// Where to send packets to!
#define DEST_ADDRESS   2
//red, aka left
#define DEST_ADDRESS   3
//green, aka right
// change addresses for each client board, any number :)
#define MY_ADDRESS     1

I would be very grateful for all help. Kind regards, Al

2

Hey, did you get the Answer?

3

I cannot get 1:2 to work.

The first client node to respond satisfies the protocol, or else the client nodes interfere with each other and the ACK reply never gets through.

4

If you are still looking for an answer...
Your client works (or should work) fine as it only has one destination to send its data to.
That's why you have

// Where to send packets to!
#define DEST_ADDRESS   1
// change addresses for each client board, any number :)
#define MY_ADDRESS     2

You send your data to DEST_ADDRESS in the client.

In you server code you have

#define DEST_ADDRESS  2
#define DEST_ADDRESS  3

Note that you use the same "alias" DEST_ADDRESS for two different values,
In other words, you are saying "The destination address is 2" and then "No, the destination address is actully 3", e.g. you override the address 2 with 3.

I'd say you need something like

#define DEST_ADDRESS_1  2
#define DEST_ADDRESS_2  3

and then your server sends what you need to send for 2 as

manager.sendtoWait(data, sizeof(data), DEST_ADDRESS_1)

If you need to send something to 3 you do

manager.sendtoWait(data, sizeof(data), DEST_ADDRESS_2)

Note that I use different DEST_ADDRESS_1 and DEST_ADDRESS_2 as the "address" in the sendtoWait call.

The above is one of the ways you can solve your problem. The best/most appropriate solution depends on what you do and what you are trying to achieve.