The netstatus applet shows signal strength for 802.11 wireless Ethernet, but
does not show signal strength on Bluetooth links. Please add this feature.

It might use something like this...


#include <bluetooth/bluetooth.h>
#include <bluetooth/bnep.h>

int get_bnep_peer(char *devname, baddr_t *bdaddr)
 struct bnep_connlist_req req;
 int i;
 
 ctl = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_BNEP);
 if (ioctl(ctl, BNEPGETCONNLIST, &req) &&
     ioctl(ctl, OLD_BNEPGETCONLIST, &req))
    barf();

 for (i=0; i< req.cnum; i++)   
   if (!strcmp(req.ci[i].device, devname) {
     *bdaddr = ci[i].dst;
     return 0;
   }
 }
 return 1;
}

 ... and with that bdaddr you can get the link quality by doing something like
what cmd_lq() in bluez-utils' hcitool.c does.