Question: Is there a way to get the Wifi signal strength ?

[thereforeiam]

In order to be able to diagnose connection problem I was wondering if it was possible to get the signal strength via the WiFi API.
I realise this is not available as part of the standard arduino lib, but GSM has something equivalent

[linagee]

Yes you can. You can do almost anything with this chip if you dive into their closed source libs. :-) (Its doing almost everything entirely in software.) I don't think you'd even need to go that far though. There appears to be some way that passive mode and the wifi scan are able to grab the RSSI. (You could probably even just use passive mode and only look at AP packets.)

[duncan-a]

Does anyone know the method for this?

I'm intending to have a 'connected' LED and it would be very useful to have
an indication of signal strength to accompany that...

On 29 April 2015 at 16:15, linagee notifications@github.com wrote:

Yes you can. You can do almost anything with this chip if you dive into
their closed source libs. :-) (Its doing almost everything entirely in
software.) I don't think you'd even need to go that far though. There
appears to be some way that passive mode and the wifi scan are able to grab
the RSSI. (You could probably even just use passive mode and only look at
AP packets.)

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#132 (comment).

[marvinroger]

As far as I know, there is currently no way in the Espressif SDK to retrieve the RSSI to the current connected AP. But as @linagee pointed out, it is possible looking at the sources to get the RSSI after a wifi scan, here is a working example:

#include <Arduino.h>
#include <ESP8266WiFi.h>

const char* SSID = "YOUR_SSID";

// Return RSSI or 0 if target SSID not found
int32_t getRSSI(const char* target_ssid) {
  byte available_networks = WiFi.scanNetworks();

  for (int network = 0; network < available_networks; network++) {
    if (strcmp(WiFi.SSID(network), target_ssid) == 0) {
      return WiFi.RSSI(network);
    }
  }
  return 0;
}

void setup() {
  Serial.begin(115200);
}

void loop() {
  unsigned long before = millis();
  int32_t rssi = getRSSI(SSID);
  unsigned long after = millis();
  Serial.print("Signal strength: ");
  Serial.print(rssi);
  Serial.println("dBm");

  Serial.print("Took ");
  Serial.print(after - before);
  Serial.println("ms");
  delay(1000);
}

Outputting

Signal strength: -60dBm
Took 2133ms
Signal strength: -57dBm
Took 2133ms
Signal strength: -57dBm
Took 2128ms
Signal strength: -58dBm
Took 2132ms
Signal strength: -62dBm
Took 2132ms
Signal strength: -57dBm
Took 2132ms

This is far from clean and ideal, as:

• It is not very bulletproof as it filters the networks by SSID, impossible to do now by mac address
• It is blocking for around 2 sec, the time to do a wifi scan, which is a huge caveat for a single threaded system

But hey, it works!

[duncan-a]

Marvin:
Thanks for that.
A two second blocking certainly less than ideal but a starting point is
always good to have at my level of comprehension.

On 1 May 2015 at 00:59, Marvin Roger notifications@github.com wrote:

As far as I know, there is currently no way in the Espressif SDK to
retrieve the RSSI to the current connected AP. But as @linagee
https://github.com/linagee pointed out, it is possible looking at the
sources to get the RSSI after a wifi scan, here is a working example:

#include <Arduino.h>
#include <ESP8266WiFi.h>
const char* SSID = "YOUR_SSID";
// Return RSSI or 0 if target SSID not foundint32_t getRSSI(const char* target_ssid) {
byte available_networks = WiFi.scanNetworks();

for (int network = 0; network < available_networks; network++) {
if (strcmp(WiFi.SSID(network), target_ssid) == 0) {
return WiFi.RSSI(network);
}
}
return 0;
}
void setup() {
Serial.begin(115200);
}
void loop() {
unsigned long before = millis();
int32_t rssi = getRSSI(SSID);
unsigned long after = millis();
Serial.print("Signal strength: ");
Serial.print(rssi);
Serial.println("dB");

Serial.print("Took ");
Serial.print(after - before);
Serial.println("ms");
delay(1000);
}

Outputting

Signal strength: -60dB
Took 2133ms
Signal strength: -57dB
Took 2133ms
Signal strength: -57dB
Took 2128ms
Signal strength: -58dB
Took 2132ms
Signal strength: -62dB
Took 2132ms
Signal strength: -57dB
Took 2132ms

This is far from clean and ideal, as:

• It is not very bulletproof as it filters the networks by SSID,
  impossible to do now by mac address
• It is blocking for around 2 sec, which is a huge caveat for a single
  threaded system

But hey, it works!

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#132 (comment).

[Links2004]

thx to latests SDK ist possible now.
see pull #325

[duncan-a]

Can somebody explain to those of us who are less 'techie' how to update the
ESP modules to the latest SDK so that we can use the new functionality???

Simple 'step by step' approach appreciated!!!

On 25 May 2015 at 12:33, Markus notifications@github.com wrote:

thx to latests SDK ist possible now.
see pull #325 #325

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#132 (comment).

[igrr]

@duncan-a
When the update is released, you will just need to open the Board Manager and click "Install" button for the ESP8266 core.

Clarification: updated package with the new SDK is not released yet. Still troubleshooting some bugs.

[duncan-a]

OK thanks - even I should be able to manage that!!!

Any idea when the update is likely to be released?

On 25 May 2015 at 12:51, Ivan Grokhotkov notifications@github.com wrote:

@duncan-a https://github.com/duncan-a
When the update is released, you will just need to open the Board Manager
and click "Install" button for the ESP8266 core.

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#132 (comment).

[Tugao]

Heyyyy
I am new with esp8266
I would like to get the name of ssid , the Signal strength and the mac address
is it possible ?
I can´t found how to get a mac address ( ap )

thanks

[Links2004]

you can use WiFi.getNetworkInfo() to get all at once or MAC only WiFi.BSSID()

Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h

Line 291 in d108a6e

bool getNetworkInfo(uint8_t networkItem, String &ssid, uint8_t &encryptionType, int32_t &RSSI, uint8_t* &BSSID, int32_t &channel, bool &isHidden);

Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h

Line 257 in d108a6e

uint8_t * BSSID(uint8_t networkItem);

Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h

Line 264 in d108a6e

String BSSIDstr(uint8_t networkItem);

[Tugao]

ooo my thanks
but, howe can I use this labarys in my project
I have others labrary liki this im my project, but
they dont work well

[Links2004]

its part of the ESP8266 project, you already have it.

#include <EPS8266WiFi.h>

and then use the functions

[Tugao]

Yes, needed to update my old library
so Now i go this information
one more time
thanks for open my eyes

I thought this command just uas possible whit at command

[Links2004]

at commands have noting to do with this project :)

[N0TB0T]

Maybe I get it wrong, but I'd have to pass about 8 arguments ot WiFi.getNetworkInfo(), so I'd have to scan the Network previously anyway?