I'm building some software that behind the scenes needs to communicate with hardware via a "message" API, over a named pipe.
For example, I can send this message:
<?xml version="1.0" encoding="UTF-8" ?> <bts version="1.0"> <cmd>getdevinfo</cmd>//Tells the hardware the message type, or command. </bts>
Here comes the challenging part: This message doesn't involve any callback. The only way I can get the response from the hardware, is to listen for incoming message events, and check their "cmd"(type).
This is of course problematic, because under certain conditions, multiple responses of this type might be emitted, whose order doesn't correspond the order of the commands sent by the clients.
The corresponding response message of the example above would be something like:
<?xml version="1.0" encoding="UTF-8" ?> <bts version="1.0"> <cmd>getdevinfo_resp</cmd>//Here i can check the message type. <middle count = “1”> <channel ip="192.168.1.35" devtype="22" devid="1" subdevid="1" Channelid="1">true</channel> </middle> </bts>
const getdevinfo_resp = await sendMessage('getdevinfo','some XML content...')//Note how the promise is resolved only when the corresponding response message arrives.
Any ideas will be greatly appreciated