Link: AREDN Webpage

Tools for Developers

This section of the AREDN® documentation contains information useful for developers who want to retrieve information from one or more nodes for use in any of several applications. For example, a developer may want to write a program which periodically polls a set of nodes to gather link quality or signal values to insert them into a network management or historian system for trending and analysis. The popular KG6WXC MeshMap application uses these tools to create and update a comprehensive mesh network map.

SYSINFO.JSON

The sysinfo.json API (Application Programming Interface) has been included in AREDN® firmware for several releases, and each release includes an api_version tag which can be used to track the feature set supported by that version of the API. As new features are added, the api_version number is incremented.

The basic API retrieves general node information in JSON format, and it can be invoked using the following URL: http://<nodename>.local.mesh/cgi-bin/sysinfo.json

The following information is always returned in the JSON data stream:

  • Node name
  • API version
  • Latitude, longitude, and grid square (if available)
  • Node Details section containing the firmware manufacturer and version, the radio model and board ID, WAN sharing status, and the node description text (if any)
  • Sysinfo section containing node uptime and load averages for the last one, five, and fifteen minutes
  • Interfaces section containing the name, MAC address, and IP address (if any) assigned to each of the node’s network interfaces
  • Mesh RF section containing the SSID, channel, center frequency, channel width, and status of the mesh radio
  • Tunnels section showing whether the tunnel package is installed and the number of active tunnels (if any)

The values returned by the API are represented in the following snippet of raw JSON. This is only a sample of the full data stream containing all of the values described above.

{
"api_version": "1.8",
"lat": "33.101010",
"lon": "-101.101010",
"grid_square": "DM22xx",
"node": "CALLSIGN-NODE-22",
"sysinfo": {
  "uptime": "5 days, 6:22:30",
  "loads": [
    0.05003,
    0.05003,
    0
    ]
  },
"node_details": {
  "description": "CALLSIGN-22 node information here...",
  "mesh_gateway": "0",
  "model": "MikroTik RouterBOARD 952Ui-5ac2nD ",
  "board_id": "0x0000",
  "firmware_mfg": "AREDN",
  "firmware_version": "1101-ad0caaf"
  }
}

In addition to the basic information described above, which is always returned with every invocation, the sysinfo.json API can also include other details based on the flags appended to the URL as explained below. In some cases it may be useful to include more than one of the following flags in the URL, and these flags can be combined using the & operator. For example, sysinfo.json?hosts=1&services=1 will include both the hosts and services information in addition to the basic details which are always returned.

Add Hosts Information

To retrieve mesh hosts information, invoke the API using the following flag on the URL: http://<nodename>.local.mesh/cgi-bin/sysinfo.json?hosts=1

A hosts section will be included in the JSON data stream containing an entry for each node and mesh-connected device. The name and IP address of each device will be shown. The values returned by the hosts flag are represented in the following snippet of raw JSON.

...
"hosts": [
  {
    "name": "CALLSIGN-NODE-22",
    "ip": "10.22.22.22"
  },
  {
    "name": "CALLSIGN-VOIP-PHONE",
    "ip": "10.22.22.24"
  },
  {
    "name": "MYCALL-NODE-81",
    "ip": "10.81.81.81"
  },
  {
    "name": "MYCALL-RPI",
    "ip": "10.81.81.83"
  }
],
...

Add Services Information

To retrieve mesh services information, invoke the API using the following flag on the URL: http://<nodename>.local.mesh/cgi-bin/sysinfo.json?services=1

A services section will be included in the JSON data stream containing an entry for each service available on the mesh. Each entry will include the service name, protocol, and link URL. The values returned by the services flag are represented in the following snippet of raw JSON.

...
"services": [
  {
    "name": "IperfSpeed",
    "protocol": "tcp",
    "link": "http:\/\/MYCALL-NODE-81\/iperfspeed"
  },
  {
    "name": "EtherPad",
    "protocol": "tcp",
    "link": "http:\/\/MYCALL-RPI:9001\/"
  },
  {
    "name": "MeshChat",
    "protocol": "tcp",
    "link": "http:\/\/MYCALL-RPI\/meshchat"
  }
],
...

Add Local Services Information

To retrieve information about the services provided only through a single node, invoke the API using the following flag on the URL: http://<nodename>.local.mesh/cgi-bin/sysinfo.json?services_local=1

A services_local section will be included in the JSON data stream containing an entry for each service available through the node being queried. Each entry will include the service name, protocol, and link URL as described above.