Merge f647ab6f03 into 37c7cebf10

2016-06-18 14:24:37 +00:00 · 2016-06-18 14:24:37 +00:00 · 9822db5885
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+# What is respondd?
+
+## Introduction
+respondd is a server distributing information within a network.
+
+For doing so, respondd spawns a udp socket (1001/udp) joining a multicast group. When a request is received, the information requested is transmitted to the requestor. 
+
+All information is oranized in a non-hierachical namespace. Each entry identifies a *provider* implemented in at least one C module. (eg `statistics`, `nodeinfo`, `...`) - each request queries a specific provider. 
+Each response is the merge-result of the output of all modules registered for the provider.
+
+Some providers are implemented in [/package/gluon-respondd](https://github.com/freifunk-gluon/gluon/tree/master).
+## Usage
+
+TODO: Why is the port number included in the multicast group, too?
+```
+respondd [-p <port>] [-g <group> -i <if0> [-i <if1> ..]] [-d <dir>]
+  -p <int>         port number to listen on
+  -g <ip6>         multicast group, e.g. ff02::2:1001
+  -i <string>      interface on which the group is joined
+  -d <string>      data provider directory (default: current directory)
+  -h               this help
+```
+
+
+
+## Procotol
+
+Request and response are encoded as *utf8*-strings. These strings are sent as UDP-Packets. Fragmentation is not supported -  gzip-compression (for the response) is optional. 
+
+- The request is the name for the provider - '`GET `' can be prepended for compression
+- The response is encoded as JSON. The structure is determined by the actual data.
+
+### Example 
+Requesting `nodeinfo` as implemented in the freifunk-gluon modules.
+
+#### Request
+```
+nodeinfo
+```
+
+#### Response
+```json
+"nodeinfo": {
+  "software": {
+    "autoupdater": {
+      "branch": "stable",
+      "enabled": true
+    },
+    "batman-adv": {
+      "version": "2015.1",
+      "compat": 15
+    },
+    "fastd": {
+      "version": "v17",
+      "enabled": false
+    },
+    "firmware": {
+      "base": "gluon-v2016.1.5-8-gdeac14e",
+      "release": "20160615"
+    },
+    "status-page": {
+      "api": 1
+    }
+  },
+  "network": {
+    "addresses": [
+      "fda0:cab1:e1e5:5116:eade:27ff:fe65:a5af",
+      "fe80::eade:27ff:fe65:a5af",
+      "2a03:2260:3011:1160:eade:27ff:fe65:a5af"
+    ],
+    "mesh": {
+      "bat0": {
+        "interfaces": {
+          "wireless": [
+            "ea:e3:29:65:a5:af",
+            "ea:e3:28:65:a5:af"
+          ],
+          "other": [
+            "ea:df:27:65:a5:af"
+          ]
+        }
+      }
+    },
+    "mac": "e8:de:27:65:a5:af"
+  },
+  "location": {
+    "latitude": 51.10727924,
+    "longitude": 7.00933367
+  },
+  "owner": {
+    "contact": "me@petabyteboy.de"
+  },
+  "system": {
+    "site_code": "lln"
+  },
+  "node_id": "e8de2765a5af",
+  "hostname": "PetaByteBoy",
+  "hardware": {
+    "model": "TP-Link TL-WDR3600 v1",
+    "nproc": 1
+  }
+}
+```
+
+## Implementing modules
+
 respondd providers are C modules (shared objects). These modules should include
 \<json-c/json.h> and \<respondd.h>, the latter of which provides the following definitions: