example.heat.yml

##
## openstack stack create -t example.heat.yml example-1
##

heat_template_version: 2016-04-08
description: |
  Deploy example

resources:

  server_root_pw:
    type: OS::Heat::RandomString

  nginx_config:
    type: OS::Heat::SoftwareConfig
    properties:
      group: ansible
      config: |
        ---
        - name: Install and run Nginx
          connection: local
          hosts: localhost
          tasks:
           - name: Install Nginx
             yum:
               name: nginx
               state: installed 
           - name: Start Nginx
             service:
               name: nginx
               state: started
               enabled: yes

  deploy_nginx:
    type: OS::Heat::SoftwareDeployment
    properties:
      config:
        get_resource: nginx_config
      server:
        get_resource: server_www1

  server_www1_floating_ip:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network_id: public

  server_www1:
    type: OS::Nova::Server
    properties:
      name: www1
      image: centos-7-64bit
      flavor: small
      key_name: my_openstack_key
      admin_pass: { get_attr: [ server_root_pw, value ] }
      user_data_format: SOFTWARE_CONFIG

  association:
    type: OS::Nova::FloatingIPAssociation
    properties:
      floating_ip: { get_resource: server_www1_floating_ip }
      server_id: { get_resource: server_www1 }

outputs:    

  server_www1_ip:
    description: The public IPv4 address of server www1
    value:
      get_attr: [ server_www1_floating_ip, floating_ip_address ]

  server_root_pw:
    description: Server root password
    value:
      get_attr: [ server_root_pw, value ]

The part that times out is the OS:Heat:SoftwareDeployment.