Using Electron in Manual or Semi-Automatic Mode Without SIM [Solved]

Troubleshooting
6

Okay. This is little embarrassing, but the following code doesn't compile:

#include "application.h"

SYSTEM_MODE(MANUAL);
//SYSTEM_THREAD(ENABLED);
 
int led1 = D0; // Instead of writing D0 over and over again, we'll write led1
int led2 = D7; // Instead of writing D7 over and over again, we'll write led2


void setup() {
  Cellular.off();
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  delay(1000);

  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  delay(1000);
}

It returns:

error: 'Cellular' was not declared in this scope

EDIT:
This link says I need to set some star flag under devices tab. My device is still unclaimed.

EDIT2: Trying to add device using particle-cli returns

Failed to claim device, server said: [object Object]

Which I guess doesn't work offline. Now what? :confused: