From 096cf070b236dfeba912fdc726da7a905f45de65 Mon Sep 17 00:00:00 2001
From: Chris Giacofei <c.giacofei@gmail.com>
Date: Tue, 11 Jan 2022 10:36:08 -0500
Subject: [PATCH] Use strings.

---
 boil_kettle/mqtt.ino | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/boil_kettle/mqtt.ino b/boil_kettle/mqtt.ino
index 20b502d..ed6eeae 100644
--- a/boil_kettle/mqtt.ino
+++ b/boil_kettle/mqtt.ino
@@ -6,7 +6,9 @@ void ConnectMQTT() {
   }
 
   Serial.println("\nconnected!");
-  mqtt_client.subscribe("brewery/setpoint/bk");
+
+  String topic = TOPIC_PREFIX + BKTOPIC;
+  mqtt_client.subscribe(topic);
 }
 
 void MessageReceived(String &topic, String &payload) {
@@ -24,10 +26,10 @@ void MessageReceived(String &topic, String &payload) {
     Serial.println(error.f_str());
     return;
   }
-  char buf[30];
-  strcpy(buf,TOPIC_PREFIX);
-  strcat(buf,BKTOPIC);
-  if (topic == buf) {
+
+  String subscribed = TOPIC_PREFIX + BKTOPIC;
+
+  if (topic == subscribed) {
     // Update PWM setpoint.
     String name = doc["entity"];
     String setting = doc["setpoint"];