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steamlink

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## SteamLink

[![Build Status](https://travis-ci.org/steamlink/steamlink.svg?branch=master)](https://travis-ci.org/steamlink/steamlink)

### Installation

SteamLink is best installed in a Python virtual environment. 
It requires python version 3.6 or better, and the python pip module.

1. Create en environment (for example 'sl') for SteamLink	```$ python3 -m venv sl```
1. Activate the new environment ```$ . sl/bin/activate``` 
1. Install (or upgrade) SteamLink from pypi ```$ pip3 install --upgrade steamlink```. Alternatively, if you have cloned the githup repository, you can install SteamLink with ```$ python3 setup.py install``` from the checked out working directory.

Steamlink will run with configuration defaults, if you don't specify a config file. You can create a default config file with the command

```$ steamlink --createconfig ```

It will create `steamlink.yaml` in your home directory. You can use the `-c <filename>` option to specify different name and/or location, both for creating and for running steamlink. Use the `-h` flag for help on available command options.

After editing the config you can start steamlink with

```$ steamlink```

You will see a couple of start-up messages and afer a momemt, you should be able to got to [http://steamlink.local:5050/]().

Pip installs a sample Steamlink "Node" in your bin/ directory.  It also runs in a Python virtual environment, so open a second terminal session, activate the environment with

```$ . sl/bin/activate``` and then run

```$ python bin/pynode-example.py```.

On the SteamLink Dashboard webpage, you will now see that a Mesh was created. Click on it, and you will find PyNode401 in the list of Nodes. Click on the PyNode401 line and you see the packets the node has sent to the central store. You can send packets to the PyNode401 via the "Send To Node" input field.  Your pynode-example program will exit if you send it "go offline".

TODO: running as a service

### Configuration
The default configuration file is `steamlink.yaml` in the user's home directory. Override with the -c option.

#### General
- `mqtt_broker` - null for external broker or section name n this config file for the internal broker definition. Default `mqtt_broker`. See <B>MQTT Broker</B> below.

- `ping_timeout` - websocket keep-alive timeout

#### Steam
- `id` - id of the top level entry, default 0
- `name` - 
- `description` - 
- `namespace` -	usually /sl

#### tests

Named sub-sections and paramaters for simple package injections tests. See -T command line option

#### Console

The `console` section defines the built-in web console.

- `host`, `port` - http server 
- `shutdown_timeout` - wait time before shutdown if web clients are connectd
- `namspace` - usually `/sl`, should match `namespace` in the`[general]` section
- `prefix` - 
- `minupdateinterval` - Number of seconds between item updates
- `index` - full path to the root web page
- `ssl_certificate` - tbd.
- `ssl_key` - tbd.

#### MQTT

The MQTT section defines the MQTT client cconnection.

- `clientid` - 
- `username` -
- `password` -
- `server` -
- `port` -
- `ssl_certificate` -

- `prefix` -	MQTT topic prefix
- `data` - MQTT suffix for data messages
- `control` -	MQTT suffix for control messages

#### MQTT Broker

Steamlink uses an MQTT broker for internal processing and for delivery of data traffic from and to network nodes. A built-in MQTT broker is used by default, the `mqtt_broker` entry in the `[general]` section will point to the configuration section for the internal broker. If you want to use an external MQTT broker, set `mqtt_broker` to blank. The client connection pararamters to your broker are define in the `[mqtt]` section.

### Operation

#### Node states

| State | Off/Online | comment
|-------|:-----------|:--------
| INITIAL| - | loaded from config, has not seen live data
| ONLINE | on | node signed on
| OFFLINE| off| node signed off with no indication of restart time
| SLEEPING| off | node signed off with intention to return
| TRANSMITTING| on | node is transmitting data but we did not see a sign-on in this session
| OVERDUE | off | no data from node longer than maximum sleep time
| OK | on | node set status

#### Packet counters

| fieldname | comment
|-----|:-----
| packets_sent | number of packets transmitted since node started
| packets_received | number of packets node received since start
| packets_resent | number of packets that were resent because of missing ACKs
| packets_dropped | number of packets that were not transmitted because of buffer full, crc failure, or invalid or unknown destination
| packets_missed | number of packets that the node should have received but never saw

#### Other packet info

| fieldname | comment
|-----|:-----
| last\_node\_restart\_ts | timestamp of last time node restarted
| last\_packet\_rx\_ts | timestamp of last packet received
| last\_packet\_tx\_ts | timestamp of last packet transmitted
| via | list of SLIDs the last packet was router via

steamlink

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