libnm and updating wifi bitrate


I'm coding a small utility using libnm.  I'd like the bitrate of wifi devices to update over time, just like in the "Connection Information" dialog of nm-applet.  However, the bitrate never seems to change.

The code below illustrates my problem:

#include <NetworkManager.h>
#include <unistd.h>
#include <stdio.h>

int main(int argc, char *argv[])
NMClient *client;
const GPtrArray *devices;
NMDevice *device;

client = nm_client_new(NULL, NULL);
devices = nm_client_get_devices(client);
device = g_ptr_array_index(devices, 0);

while (1) {

This program just prints the same number over and over again -- the value of the bitrate when the program was first started.  Meanwhile, I can open an nm-applet dialog simultaneously and watch the bitrate change merrily over time.

What am I missing?

Thank you!

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