node-red-nodes/io/ping

node-red-node-ping

A Node-RED node to ping a remote server, for use as a keep-alive check.

Install

Run the following command in your Node-RED user directory - typically ~/.node-red

npm install node-red-node-ping

Gotchas

1 Ubuntu Snap containers are strict and do not like giving external commands (like ping) external access. To allow ping to work you must manually add the network-observe interface

 sudo snap connect node-red:network-observe

2 On some versions on Raspbian (Raspberry Pi) ping seems to be a root only command. The fix is to allow it as follows

sudo setcap cap_net_raw=ep /bin/ping
sudo setcap cap_net_raw=ep /bin/ping6

Usage

Pings a machine and returns the trip time in mS as msg.payload.

Returns boolean false if no response received, or if the host is unresolveable. msg.error will contain any error message if necessary.

msg.topic contains the ip address of the target host.

Default ping is every 20 seconds but can be configured.