sketching out clients

Makefile

@@ -21,3 +21,11 @@ stop-dev:
 install-dev-deps:
 	python3 -m pip install pre-commit
 .PHONEY: install-dev-dep
+
+run-pub:
+	go run ./cmd/publisher/main.go
+.PHONEY: run-pub
+
+run-sub:
+	go run ./cmd/subscriber/main.go
+.PHONEY: run-sub

README.md

@@ -2,8 +2,6 @@
 
 Learning MQTT with Golang by doing. This repo is a simple example of using a Golang application as a client (pub & sub) of an MQTT broker.
 
-
-8088, Management Center unsecured (opening the port on the internet is not recommended).
 1883, Eclipse Mosquitto unsecured (opening the port on the internet is not recommended).
 
 ## Development
@@ -39,7 +37,7 @@ make stop-dev
 
 - [Mosquitto Docs](https://mosquitto.org/man/mosquitto-8.html)
 - [Mosquitto TLS Tutorial](https://cedalo.com/blog/mqtt-tls-configuration-guide/)
-- [Golang MQTT Tutorial]()
+- [Golang MQTT Tutorial](https://www.emqx.com/en/blog/how-to-use-mqtt-in-golang)
 - [MQTT as a Service](https://cedalo.com/mqtt-broker-pro-mosquitto/)
 - [Using Wireshare for MQTT Analysis](https://cedalo.com/blog/wireshark-mqtt-guide/)
 - [Caddy as reverse proxy](https://github.com/caddyserver/caddy)

cmd/publisher/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("MQTT Publisher")
+}

cmd/subscriber/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("MQTT Subscriber")
+}

common/common.go

@@ -3,11 +3,11 @@ package common
 import "os"
 
 // GetenvDefault retrieves an environment variable if set, or a provided default
-func GetenvDefault(key string, d string) string {
-	val, ok := os.LookupEnv(key)
-	if ok {
+func GetenvDefault(key string, defaultValue string) string {
+	val, exists := os.LookupEnv(key)
+	if exists {
 		return val
 	} else {
-		return d
+		return defaultValue
 	}
 }