WiFi.RSSI() example not working

hi!

i trying use wifi.rssi() example found @ https://www.arduino.cc/en/reference/wifirssi no success on wemos

the code in site:

code: [select]

#include <spi.h>
#include <wifi.h>

//ssid of network
char ssid[] = "leo-link";
//password of wpa network
char pass[] = "supergeheim";


void setup()
{
 wifi.begin(ssid, pass);

  if (wifi.status() != wl_connected) {
    serial.println("couldn't wifi connection");
    while(true);
  }
  // if connected, print out info connection:
  else {
   // print received signal strength:
  long rssi = wifi.rssi();
  serial.print("rssi:");
  serial.println(rssi);
  }
}

void loop () {}

what in serial monitor following:

"ets jan  8 2013,rst cause:4, boot mode:(1,7)

wdt reset"


any ideas?

what board? core? explain how uploading sketch. have uploaded simpler sketches successfully?

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