Device API

Device is a special application that represents a single physical device. It is benefical to see the difference between random application and application that runs in dedicated device and controls such device. This allows generic identification of such devices in the SHV tree.

The call to :ls(".app") can be used to identify application as being a device.

.device:name

This method must provide the device name. This is a specific generic name of the device.

=> <id:42, method:"name", path:".device">i{}
<= <id:42>i{2:"OurDevice"}

.device:version

This method must provide version (revision) of the device.

=> <id:42, method:"name", path:".device">i{}
<= <id:42>i{2:"g2"}

.device:serialNumber

This method can provide serial number of the device if that is something the device has. It is allowed to provide Null in case there is no serial number assigned to this device.

=> <id:42, method:"serialNumber", path:".device">i{}
<= <id:42>i{2:"12590"}

.device:uptime

This provide current device's uptime in seconds. It is allowed to provide Null in case device doesn't track its uptime.

=> <id:42, method:"uptime", path:".device">i{}
<= <id:42>i{2:3842}

.device:reset

Initiate the device's reset. This might not be implemented and in such case NotImplemented error should be provided.

=> <id:42, method:"reset", path:".device">i{}
<= <id:42>i{}

.device/alerts:get

Get the current device's alerts.

The .device/alerts node is property node. Its implementation is optional and thus if device doesn't raise any alerts then this node should not be present.

• 0 (date): date and time of the alert creation.
• 1 (level): int with notice level. This is value between 0 and 63 that can be used to sort alerts. The classification is to the three named levels:
  • Notice: from 0 to 20. These are alerts signal that do not affect nor primary nor secondary device's functionality but require some attention. These can also be potential issues that would affect the device's secondary functionality.
  • Warning: from 21 to 42. These are levels to be used for issues not affecting the device's primary functionality or notices for possible issues that would affect the primary functionality.
  • Error: from 43 to 63. These should be used for issues affecting the primary functionality of the device.
• 2 (id): string with notice identifier. This identifier should be chosen to be unique for not for the single device but also between devices. It should be short but at the same time precise and unique. The benefit is human readability. This ID then should be used in device's manual.
• 3 (info): any SHV value that provides additional info. This is optional field that can be used to pass some additional info related to the alert. The value interpretation should be documented but is outside of the SHV scope.

=> <id:42, method:"get", path:".device/alerts">i{}
<= <id:42>i{2:[i{0:d"2017-05-03T15:52:31.123", 1:42, 2:"EX_CMP_TEST"}]}

.device/alerts:get:chng

The alerts change must be signaled with chng signal.

<= <signal:"chng", path:".device/alerts", source:"get">i{1:[]}