tree fbc9aa7cd83aea699ca1aeaca6eb89b19301cc07
parent 50942427deeb3e4a6e79901a2c077e582cc90d89
author Abtin Keshavarzian <abtink@google.com> 1509484504 -0700
committer Jonathan Hui <jonhui@nestlabs.com> 1509484504 -0700

[child-table] emit child entry inserted/removed from NCP (#2280)

This commit adds new public OpenThread API to set a callback for user
to be notified when a child table entry is being added or removed. This
callback provides info about the child entry and is always invoked before
the `otStateChangedCallback`.

This commit also updates the `NcpBase` implementation to use the new
callback and emit a `VALUE_INSERTED` or `VALUE_REMOVED` async spinel
frame to host whenever child table gets updated. If the async spinel
frame can not be sent (running out of NCP buffer space), an async
`LAST_STATUS(NOMEM)` spinel frame is sent and the entire child table
is sent later (when buffer becomes available) as an async `VALUE_IS`
spinel message.