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Let's take a look at adding a policy to a virtual fire alarm, where the bulb in the fire alarm will switch on if the sensor on the device reports a room temperature higher than 50 degrees Celsius. 

Follow the instructions given below to add a policy to the virtual fire alarm: 

1. Sign into the Device Management console.
2. Click Add under POLICIES to add a new policy.
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3. Select the virtual fire alarm device platform.

4. Configure the profile and click CONTINUE.

   • You can configure the profile by passing a set of strings to the device. Take a look at the examples given below on how the Siddhi Query Language (SiddhiQL) is used configure the profile.
     Example 

     Code Block
     define stream fireAlarmEventStream (temp int); from fireAlarmEventStream#window.time(30 sec) select max(temp) as maxValue insert into analyzeStream for expired-events; from analyzeStream[maxValue < 50] select maxValue insert into bulbOnStream; from fireAlarmEventStream[temp > 50] select temp insert into bulbOffStream;

   • WSO2 IoT Server provides policies by default to manage mobile devices. For more information on the available policies, see available device management policies.
5. Assign the configured profile to the preferred user groups.
   1. Assign the policy to user roles or users:

   • Assigning user role/s.

     1. Select the set user role/s option.

     2. Select the preferred role from the item list.

        Info
        The items that are listed here, are the roles that were added when managing roles through the WSO2 IoTS device management console. For more information, see managing roles.

   • Assigning user/s.
     1. Select the set user/s option.
     2. Enter the characters of the username/s you wish to add, and the system will prompt the users having the names with the characters you entered. You can select the users from the item list.

   2. Select the action that has to be carried out when a device has not complied with a policy.

      Info
      In the context of WSO2 IoTS, the following actions are referred to as non-compliance rules. Further, the policies are monitored via the non-compliance rules.

      Non-compliance rules	Description
      Enforce	Forcefully enforce the policies on the assigned groups.
      Warning	If the assigned groups do not adhere to the given policies a warning message will be sent.
      Monitor	If the assigned groups do not adhere to the given policies the server is notified of the violation unknown to the user and the administrator can take the necessary actions with regard to the reported.

   3. Click SAVE.
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6. Define a name for the configured profile of policies and a description.

   Info
   Set a Name to your Policy is a mandatory field.

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7. Click Save to SAVE the configured profile or click SAVE & PUBLISH to save and publish the configured profile as an active policy to the database.

   Info

   If you SAVE the configured profile it will be in the inactive state. Therefore, the policy will not be taken into account when the IoT Server filters policies, to enforce a suitable policy on a device that registers with WSO2 IoTS. If you SAVE & PUBLISH the configured profile of policies it will be in the active state. The active policies will be enforced on new devices that enroll with WSO2 IoTS based on the Policy enforcement criteria. If you want to push this policy to the existing devices and want this policy to be applied to the devices, click Apply changes. Then the newly added policy will be a candidate in the policy selection pool based on the policy Enforcement criteria.