Hi, May know how to get mac id of my board only.
i did try use "node-red-contrib-arp" but it's dashboard palette.
Your router should contain that information, otherwise you could use "Advanced IP Scanner" (Google it) to obtain the MAC address.
One word Fing.
Perhaps more than one word would be a bit more useful here. Is that a node?
Do you mean you just need to know what it is? In which case, in a terminal on the pi, run
ifconfig
and that will show you the mac address for each network interface on the board.
or
cat /sys/class/net/wlan0/address
to directly get the wlan0 address, so you can e.g. use it with the exec node in NR.
[{"id":"583ba2f6.4012fc","type":"exec","z":"cf6706ec.415a58","command":"cat /sys/class/net/wlan0/address","addpay":false,"append":"","useSpawn":"false","timer":"","oldrc":false,"name":"","x":380,"y":100,"wires":[["cc01fefb.e547f"],[],[]]},{"id":"a6d062e9.c5ddb","type":"inject","z":"cf6706ec.415a58","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":160,"y":100,"wires":[["583ba2f6.4012fc"]]},{"id":"cc01fefb.e547f","type":"debug","z":"cf6706ec.415a58","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":630,"y":100,"wires":[]}]
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In the time it took you to type that you could have clicked on the word and searched for an answer that would be far better than anything I could include.
Assuming it is using a wireless connection.
Yes, everyone reading this thread could have searched the term to figure out what you were referring to. Or you could have mentioned its a mobile app and saved everyone that effort.
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@tramanah The Debug node shows msg.payload is already an Object. You do not need to parse it further.
The docs have a whole section on how to understand the structure of a message, recognise if it is a JSON string or Object and how to identify the path to any element of the message using the Debug sidebar. https://nodered.org/docs/user-guide/messages
Please have a read through of that, as much of the advice we'd give at this point is straight out of that page.
Try a change node, with following content
Just adapt it to whatever data you want to extract.
var obj = msg.payload;
var json = JSON.parse(obj);
var MAC = json["networkInterfaces"]["Wi-Fi"][0].mac;
msg.payload = MAC;
return msg;
Manage to get the mac id.
