EZSP application layer over Zigbee.EZSP.ASH.Connection.

This is the low-level EmberZNet protocol client, a thin, synchronous command/response transport over the NCP. Most code should use the Zigbee facade with Zigbee.EZSP.Adapter instead, which adds the coordinator sequence (form, endpoints, unicast) and normalizes NCP callbacks into backend-neutral events. Reach for this module directly only for raw EZSP commands the adapter doesn't expose.

On startup this server opens the serial port, performs the ASH reset handshake, then negotiates the EZSP protocol version (the mandatory first command). After that, command/3 issues EZSP commands and blocks for the matching response; unsolicited NCP callbacks are forwarded to a subscriber.

Example

{:ok, ezsp} = Zigbee.EZSP.start_link(device: "/dev/cu.usbmodem1CDBD45F0F5C1")
Zigbee.EZSP.info(ezsp)
#=> %{protocol_version: 13, stack_type: 2, stack_version: "7.4.4.0"}

{:ok, frame} = Zigbee.EZSP.command(ezsp, 0x0026, <<>>)  # getEui64