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MQTT bridge

Project Description
# mqspeak - MQTT bridge

mqspeak is [MQTT]( client which collect data and transforms
them into [ThingSpeak]( channel updates or [Phant](
data streams. It is able to handle multiple MQTT connections and independetly update
multiple channels.

This is part of my IoT project. You can
read more about it on my [blog](

## Install

Application can be installed with following command:

$ sudo pip3 install mqspeak

## Configuration

mqspeak is configured using configuration file specified with `-c` or `--config`
option (default `/etc/mqspeak.conf`). This is sample configuration file:

Enabled = temperature-broker humidity-broker door-broker

Host = temperatureBrokerHostname
Port = 1883
User = brokerUser
Password = brokerPass
Topic = sensors/temperature sensors/something

Host = humidityBrokerHostname
Port = 1883
User = brokerUser
Password = brokerPass
Topic = sensors/humidity

Host = doorBrokerHostname
Port = 1883
User = brokerUser
Password = brokerPass
Topic = #

Enabled = channel1 channel2 channel3 channel4

Type = thingspeak
UpdateRate = 15
UpdateType = blackout
UpdateFields = dht-update

Type = thingspeak
UpdateRate = 15
UpdateType = buffered
UpdateFields = dht-update

Type = thingspeak
UpdateRate = 15
UpdateType = average
UpdateFields = dht-update

Type = phant
UpdateRate = 15
UpdateType = onchange
UpdateFields = door-update

field1 = humidity-broker sensors/humidity
field2 = temperature-broker sensors/temperature

state = door-broker sensors/door

Configuration file has two mandatory sections: `[Brokers]` and `[Channels]`, each with
one `Enabled` option. These options contains space separated broker and channel
section names.

### Broker section

Broker section has to define one mandatory `[Topic]` option, which is space separated
list of MQTT topic subscriptions. Full list of possible options in broker section:

- `Host` - Broker IP address or hostname (default
- `Port` - Broker port (default 1883).
- `User` - Username.
- `Password` - Password.
- `Topic` - Space separated list of topic subscriptions. Mandatory option.

### Channel section

Each channel section has to define `Key`, `UpdateRate` and `UpdateType` options.

- `Id` - Channel ID. This field is mandatory for Phant channels.
- `Key` - Channel API write key. Mandatory option.
- `Type` - Specify channel type. Mandatory option. Following types are supported:
- `thingspeak` - [ThinkSpeak]( channel.
- `phant` - [Phant]( channel.
- `UpdateRate` - Channel update interval in seconds. Currently, ThinkSpeak allows
interval 15 seconds or greater. Mandatory option.
- `WaitInterval` - Maximum interval to wait for remaining data to arrive. When set to
zero, wait forever (default). See **Update waiting** for more details.
- `UpdateType` - Channel update type. Possible values are `blackout`, `buffered`,
`average` and `onchange`. Mandatory option.
- `blackout` - Until `UpdateRate` interval is expired, any incoming data are
ignored. First data received after interval expiration are sent to ThingSpeak.
- `buffered` - Incoming data are buffered during `UpdateRate` interval. After
this interval expires, most recent values are immediately sent.
- `average` - Similar to `buffered` but mqspeak calculates average value of these
data. Any data which cannot be converted into real numbers are ignored. Channel
is immediately updated after `UpdateRate` interval is expired.
- `onchange` - Data are marked with timestamp and stored in queue. Each item is
sent after `UpdateRate` interval expires. **_Not implemented yet._**
- `UpdateFields` - Specify section which defines updates for this channel. Mandatory option.

#### Update waiting

When channel update consists of data from multiple sensors, it may happen that one
sensor die. By default channel never will be updated until data from all sensors arrives.
Inactive sensor causes channel update will be stalled.

When update waiting enabled, mqspeak will wait defined amount of seconds and then sends
out even incomplete channel update.

Waiting scenario can be divided into following cases:

- **`UpdateRate` condition is met but there are no data.** Wait mechanism is not activated
until some data arrives. After it received first part of channel update, mqspeak will wait
defined time and tries collect remaining data. After `WaitInterval` expires,
data will be send.
- **Partial data arrives before `UpdateRate` condition is met.** Waiting is delayed
until `UpdateRate` condition is met. After it expires and there are still not
all required data, waiting is triggered. After `WaitInterval` expires, data
will be send.
- **All required data are collected before `UpdateRate` condition is met.** There is no
need to activate update waiting. Simply send data.

### UpdateFields section

UpdateFields section consists of any number of options. Each option key specifies
field name. Its value must be space separated name of broker section and topic.

For ThinkSpeak channel, only option keys `Field1` ... `Field8` are valid.

## Questions

- **mqspeak runs in foreground only.** - Yes, there is no double fork combo to run
mqspeak in background. I use systemd init and I prefer to run all services as simple
systemd units, which runs in foreground. Sorry about that.
- **It uses python3. Is python 2.x supported?** - No, I don't plan to support python 2.x.
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