ESP8266 WiFi signal strength

Question

how to use AT+CWLAP in esp8266 to get wifi signal strength? I want to get the signal strength which is displayed on the serial monitor and use it in my code in arduino IDE!

Answer 1

After sending the AT+CWLAP command, ESP8266 will answer with a list of all available AP's detected.

The format of the response will be like:

+CWLAP:<ecn>,<ssid>,<rssi>,<mac>,<freq offset,<freq calibration>

where:

<ecn>: indicates the security level, from 0 (OPEN) to 4 (Maximum security level)

<ssid>: it's the ssid of the AP

<rssi>: it's the signal strength, which is indicated in decibel format (e.g. -70)

<mac>: it's the MAC address

<ch>: channel

<freq offset>: ut's the frequency offset of AP，unit：KHz.

<freq calibration>: it's the calibration for frequency offset

So, the <rssi> parameter is what you are interested in.

Maybe, depending on the firmware version of your ESP8266, it's possible that AT+CWLAP command returns a different number of parameters, omitting, for example, the last four.