Add required libraries

Add the following libraries to your PlatformIO project.

MFRC522

• In the PlatformIO home screen, open Libraries.
• In the search field, type:

header:MFRC522.h

• The first result should be MFRC522 by Miguel André Balboa. Click to open it.

• Click Add to project

• Click Add

PubSubClient

• In the PlatformIO home screen, open Libraries.
• In the search field, type:

PubSubClient

• The first result should be PubSubClient by Nick O’Leary. Click to open it.

• Click Add to project
• Click Add