- add Makefile

- improve README.md
- smaller fixes regarding configuration

.gitignore

@@ -0,0 +1 @@
+install/*

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/rpiMqttControl.iml" filepath="$PROJECT_DIR$/.idea/rpiMqttControl.iml" />
+    </modules>
+  </component>
+</project>

.idea/rpiMqttControl.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

Makefile

@@ -0,0 +1,35 @@
+BINARY_NAME=rpicontrol
+GIT_COMMIT=$(shell git rev-list -1 HEAD --abbrev-commit)
+VERSION=1.0.0
+
+get:
+	go get .
+build_rpi: get
+	GOARCH=arm GOOS=linux go build -ldflags "-X main.GitCommit=${GIT_COMMIT} -X main.Version=${VERSION} -X main.Arch=${GOARCH}" -o ${BINARY_NAME} main.go
+build_linux: get
+	GOARCH=amd64 GOOS=linux go build -ldflags "-X main.GitCommit=${GIT_COMMIT} -X main.Version=${VERSION} -X main.Arch=${GOARCH}" -o ${BINARY_NAME} main.go
+
+run:
+	./${BINARY_NAME} -config rpicontrol.conf.example -log info
+
+build_and_run: build run
+
+clean:
+	go clean
+	-rm ${BINARY_NAME}
+	-rm -fr install
+	-rm -f rpicontrol-${VERSION}.tar.gz
+pack:
+	mkdir -p install/etc/rpicontrol
+	mkdir -p install/usr/lib/systemd/system
+	mkdir -p install/usr/bin
+	cp rpicontrol.conf.example install/etc/rpicontrol/rpicontrol.conf.example
+	cp rpicontrol.service install/usr/lib/systemd/system/rpicontrol.service
+	cp rpicontrol install/usr/bin 
+	tar cfvz rpicontrol-${VERSION}.tar.gz -C "install/" .
+
+deploy:
+	tar xfvz rpicontrol-${VERSION}.tar.gz -C /
+	systemctl daemon-reload
+	systemctl start rpicontrol
+

README.md

@@ -1,18 +1,115 @@
 Raspberry MQTT Control
 =====================
 
-Description
+## Description
----------------
+This is a linux daemon application for Raspberry PI, which receives control commands via MQTT to set GPIO ports of Raspberry.
-This is a linux daemon application for Raspberry PI, which receives control commands via MQTT to remotely control IO ports of Raspberry.
+As MQTT is widely supported within different home automation systems, this daemon application should be quite easily be integrated, for example in [OpenHAB](https://www.openhab.org/)
-Application is fully configurable with YAML config file.
+For further information, how to configure and use OpenHAB MQTT Binding, please see [here](https://www.openhab.org/addons/bindings/mqtt.generic/)
+
+## Usage
+This application is fully controlled via MQTT Pub/Sub mechanism.
+- To test the behavior, install and start an MQTT broker the linux daemon *rpicontrol*, as described in chapter _Installation_.
+- As soon as everything is running, you can test the switch of output pins via following command:
+  
+  `mosquitto_pub -h localhost -t /rpicontrol/gpio/out1/control -m ON`
+
+  This command will set the configured GPIO pin with name *out1* to state _ON_. 
+  State _OFF_ will also work of course.
+
+  - this command refers to example config as described below. If you have configured different pin names, broker address, or topic prefix, 
+    you have of course to adapt the command according to your configuration.
+- In order to see current states of all configured GPIO pins, you can subscribe via wildcard to the MQTT topic:
+
+  `mosquitto_sub -h localhost -t "/rpicontrol/#" -v`
+  - Again, this command refers to example config as described below. If you have configured different pin names, broker address, or topic prefix, you have of course to adapt the command according to your configuration.
   
   
  
-Installation and Usage
+
--------------------------
+## Installation
-tbd.
+- Install and configure an appropriate MQTT broker either locally or on your network.
+  for this, the open-source broker [mosquitto](https://mosquitto.org/) will be a good choice. 
+  For installing and configuring mosquitto for your platform, please see the mosquitto docs.
+
+- untar the package tarball with following command:
+  
+  `sudo tar xfvz -C / rpicontrol-a.b.c.tar.gz`, where _a.b.c_ represents the version of rpicontrol
+
+- use the example config file as initial configuration
+  
+  ```
+  cp /etc/rpicontrol/rpicontrol.conf.example /etc/rpicontrol/rpicontrol.conf
+  ```
+- edit the configuration file `/etc/rpicontrol/rpicontrol.conf` to your needs, see chapter _Configuration_
+
+- reload systemd, enable and start service:
+
+  ```
+  sudo systemctl daemon-reload
+  sudo systemctl enable rpicontrol.service
+  sudo systemctl start rpicontrol.service
+  ```
+
+
+## Configuration
+
+### Example Configuration
+Configuration file has YAML syntax, and shall have following structure.
+Please note that optional values are not needed for configuration, see _Available Parameters_
+
+
+```
+mqtt-config:
+  broker-address: "tcp://localhost:1883"
+  connect-timeout-ms: 10000 
+  connect-retry-interval-ms: 10000
+  max-reconnect-interval-ms: 10000
+  topic-prefix: "/rpicontrol"
+  username: "rpicontrol"
+  password: "my_password"
+
+pin-control-config:
+  gpio-pins:
+    - number: 17                             
+      name: out1
+      direction: Output
+      pull-config: PullOff
+      send-polling-events: false
+      send-change-events: true
+      initial-state: "OFF"
+
+  polling-time-ms: 100
+```
+### Available Parameters
+
+- **mqtt-config**: section for configuring MQTT Broker Connection
+  - **broker-address**: URL for MQTT Broker. Example Value: "tcp://localhost:1883"
+  - **connect-timeout-ms**: (optional) timeout in milliseconds for connection
+  - **connect-retry-interval-ms**: (optional) connection retry interval in milliseconds
+  - **max-reconnect-interval-ms**: (optional) max connection retry interval time in milliseconds
+  - **topic-prefix**: (optional) prefix for MQTT topic 
+  - **username**: (optional) username for MQTT connection
+  - **password**: (optional) password for MQTT connection
+
+- **pin-control-config**: section for configuring GPIO Pins that shall be used
+  - **gpio-pins**: list of GPIO pins
+    - **number**: number of GPIO pin, see [Raspberry Pi: GPIO - General Purpose Input Output](https://www.elektronik-kompendium.de/sites/raspberry-pi/2002191.htm)
+    - **name**: custom name for the pin (used for MQTT topic).
+    - **direction**: configure GPIO direction. Available Values: Input, Output
+    - **pull-config**: configure GPIO pull-up/down resistor. Available Values:
+      - PullDown: pull-down resistor
+      - PullUp: pull-up resistor
+      - PullOff: no resistor
+    - **send-polling-events**: (optional) send pin state via MQTT on every polling event. Available Values:
+      - true: enable send on polling event
+      - false (default): disable send on polling event
+    - **send-change-events**: (optional) send pin state via MQTT on a change event. Available Values:
+      - true: enable send on change events
+      - false (default): disable send on change events
+    - **initial-state**: (optional) set of initial state of output pin at start of application. Available Values:
+      - ON: initial state set to ON at startup
+      - OFF: initial state set to OFF at startup
+      - [not set]: do not set initial state at startup
+  - **polling-time-ms**: (optional) interval in milliseconds (default: 100), for cyclically polling the current state of all pins.
     
     
-Compiling
----------
-tbd.

go.mod

@@ -5,12 +5,12 @@ go 1.17
 require (
 	github.com/eclipse/paho.mqtt.golang v1.3.5
 	github.com/sirupsen/logrus v1.8.1
+	github.com/stianeikeland/go-rpio v4.2.0+incompatible
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
 require (
 	github.com/gorilla/websocket v1.4.2 // indirect
-	github.com/stianeikeland/go-rpio v4.2.0+incompatible // indirect
 	golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0 // indirect
 	golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd // indirect
 )

internal/PinControlService/Pin.go

@@ -10,7 +10,7 @@ type Pin struct {
 	Name              string
 	Direction         PinDirection
 	PullConfig        PinPull
-	InitialState      PinCommand
+	InitialState      *PinCommand
 	PinHandle         HardwarePinInterface
 	SendPollingEvents bool
 	SendChangeEvents  bool
@@ -37,11 +37,7 @@ func NewPin(config PinConfig) Pin {
 		p.SendChangeEvents = true
 	}
 
-	if config.InitialState != "" {
+	p.InitialState = config.InitialState
-		p.InitialState = PinCommand(config.InitialState)
-	} else {
-		p.InitialState = Off
-	}
 
 	return p
 }
@@ -80,8 +76,11 @@ func (p *Pin) Configure() {
 	} else if p.Direction == Output {
 		log.Infof("configuring pin %s (pin no: %d) as Output", p.Name, p.Id)
 		p.PinHandle.Output()
+		if p.InitialState != nil {
 			log.Infof("set initial state \"%s\" for pin %s (pin no: %d)", p.InitialState, p.Name, p.Id)
-		_ = p.Command(p.InitialState)
+			_ = p.Command(*p.InitialState)
+		}
+
 	}
 
 	p.PinHandle.Detect(AnyEdge)
@@ -92,6 +91,8 @@ func (p *Pin) Configure() {
 		p.PinHandle.PullDown()
 	} else if p.PullConfig == PullOff {
 		p.PinHandle.PullOff()
+	} else {
+		log.Errorf("unknown config value \"%s\" for pull-config", p.PullConfig)
 	}
 
 }

internal/PinControlService/PinControlConfig.go

@@ -5,16 +5,14 @@ type PinConfig struct {
 	Name              string       `yaml:"name"`
 	Direction         PinDirection `yaml:"direction"`
 	PullConfig        PinPull      `yaml:"pull-config"`
-	InitialState PinCommand   `yaml:"initial-state"`
+	InitialState      *PinCommand  `yaml:"initial-state"`
 	SendPollingEvents *bool        `yaml:"send-polling-events"`
 	SendChangeEvents  *bool        `yaml:"send-change-events"`
-
 }
 
 type PinControlConfig struct {
 	GpioPins      []PinConfig `yaml:"gpio-pins"`
 	PollingTimeMs int         `yaml:"polling-time-ms"`
-
 }
 
 func NewPinControlConfig() PinControlConfig {

internal/PinControlService/Types.go

@@ -17,7 +17,7 @@ const (
 	Input  PinDirection = "Input"
 	Output PinDirection = "Output"
 
-	PullUp   PinPull = "PULL_UP"
+	PullUp   PinPull = "PullUp"
-	PullDown PinPull = "PULL_DOWN"
+	PullDown PinPull = "PullDown"
-	PullOff  PinPull = "PULL_OFF"
+	PullOff  PinPull = "PullOff"
 )

main.go

@@ -10,12 +10,26 @@ import (
 	"rpiMqttControl/internal/PinControlService"
 )
 
+var (
+	Version   string = "0.0.0"
+	GitCommit string = "000000"
+)
+
 func main() {
+	versionStr := Version + "-" + GitCommit
 	flagConfig := flag.String("config", "/etc/rpicontrol/rpicontrol.conf", "path to config file")
 	flagLogLevel := flag.String("log", "info", "set log level for console output")
+	flagVersion := flag.Bool("version", false, "output version and exit")
 
 	flag.Parse()
 
+	if *flagVersion {
+		print(versionStr)
+		os.Exit(0)
+	}
+
+	log.Infof("starting rpicontrol Version %s", versionStr)
+
 	if level, err := log.ParseLevel(*flagLogLevel); err != nil {
 		log.SetLevel(log.WarnLevel)
 		log.Warnf("could not set log level. %s", err.Error())

rpicontrol.conf.example

@@ -10,5 +10,7 @@ pin-control-config:
       name: out1
       direction: Output
       pull-config: PullOff
+      send-polling-events: false
+      send-change-events: true
 
   polling-time-ms: 100

rpicontrol.service

@@ -9,15 +9,11 @@ Group=root
 
 Restart=on-failure
 RestartSec=10
-startLimitIntervalSec=60
 
 WorkingDirectory=/usr/bin
 ExecStart=/usr/bin/rpicontrol
 
 # make sure log directory exists and owned by syslog
-PermissionsStartOnly=true
-StandardOutput=syslog
-StandardError=syslog
 SyslogIdentifier=rpicontrol
 
 [Install]