Bluetooth readRSSI not working



I’m trying to use Bluetooth Serial and read the RSSI data. I have no problem connecting, reading and writing data, however, readRSSI function simply returns “Invalid Action”.

Here’s the code:

			this.bluetoothSerial.readRSSI().then((success) => {
			}, (error) => {

That’s after importing bluetoothSerial and injecting it into the constructor. As I said, no issues with connecting to a device, reading and writing. Am I using the readRSSI function incorrectly?

Ionic Info:
@ionic/cli-utils : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : not installed

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 6.2.3
Ionic Framework    : ionic-angular 3.9.2


Android SDK Tools : 25.2.5
Node              : v6.11.2
npm               : 3.10.10
OS                : Windows 8.1

Environment Variables:

ANDROID_HOME : C:\Program Files (x86)\Android\android-sdk


backend : legacy