services:
    sender:
        build: 
            context: sender
        depends_on:
          - receiver1
          - receiver2
          - receiver3
        ports:
          - 9999:9999/udp 
    receiver1:
        build: 
            context: receiver
    receiver2:
        build: 
            context: receiver
    receiver3:
        build: 
            context: receiver