protected void respondToIsIn(Matcher m, Tweet msg) {
		String username = msg.getUser().getScreenName();
		String deviceId = this.db.getDeviceIdFromUsername(m.group(1));
		System.out.println(String.format("[DEVICE ID]: %s -> %s", m.group(1), deviceId));
		while(true) {
			try {
				this.nearbyUsersSemaphore.acquire();
				System.out.print("[IDs IN]:");
				for(String d: this.nearbyUsers) {
					System.out.println(String.format("%s ", d));
				}
				if(this.nearbyUsers.contains(deviceId))
					this.messagesToPublish.add(String.format("@%s, @%s is in the room.", username, m.group(1)));
				else
					this.messagesToPublish.add(String.format("@%s, @%s is not in the room.", username, m.group(1)));
				this.nearbyUsersSemaphore.release();
				break;
			} catch (InterruptedException e) {
				
			}
		}
	}