From e85157db4b246fd3c701c7b4195d4f52b735c554 Mon Sep 17 00:00:00 2001
From: Jason Nagin <33561705+JasonN3@users.noreply.github.com>
Date: Wed, 30 Oct 2024 15:34:33 -0400
Subject: [PATCH] Add config for current temperature precision (#7699)

---
 esphome/components/mqtt/mqtt_climate.cpp | 6 ++++--
 esphome/components/mqtt/mqtt_const.h     | 4 ++++
 tests/components/mqtt/common.yaml        | 4 ++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/esphome/components/mqtt/mqtt_climate.cpp b/esphome/components/mqtt/mqtt_climate.cpp
index 49a8f06734..773d863835 100644
--- a/esphome/components/mqtt/mqtt_climate.cpp
+++ b/esphome/components/mqtt/mqtt_climate.cpp
@@ -71,8 +71,10 @@ void MQTTClimateComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryCo
   root[MQTT_MIN_TEMP] = traits.get_visual_min_temperature();
   // max_temp
   root[MQTT_MAX_TEMP] = traits.get_visual_max_temperature();
-  // temp_step
-  root["temp_step"] = traits.get_visual_target_temperature_step();
+  // target_temp_step
+  root[MQTT_TARGET_TEMPERATURE_STEP] = traits.get_visual_target_temperature_step();
+  // current_temp_step
+  root[MQTT_CURRENT_TEMPERATURE_STEP] = traits.get_visual_current_temperature_step();
   // temperature units are always coerced to Celsius internally
   root[MQTT_TEMPERATURE_UNIT] = "C";
 
diff --git a/esphome/components/mqtt/mqtt_const.h b/esphome/components/mqtt/mqtt_const.h
index c1c40c4b6d..445457a27f 100644
--- a/esphome/components/mqtt/mqtt_const.h
+++ b/esphome/components/mqtt/mqtt_const.h
@@ -51,6 +51,7 @@ constexpr const char *const MQTT_COMMAND_TOPIC = "cmd_t";
 constexpr const char *const MQTT_CONFIGURATION_URL = "cu";
 constexpr const char *const MQTT_CURRENT_HUMIDITY_TEMPLATE = "curr_hum_tpl";
 constexpr const char *const MQTT_CURRENT_HUMIDITY_TOPIC = "curr_hum_t";
+constexpr const char *const MQTT_CURRENT_TEMPERATURE_STEP = "precision";
 constexpr const char *const MQTT_CURRENT_TEMPERATURE_TEMPLATE = "curr_temp_tpl";
 constexpr const char *const MQTT_CURRENT_TEMPERATURE_TOPIC = "curr_temp_t";
 constexpr const char *const MQTT_DEVICE = "dev";
@@ -232,6 +233,7 @@ constexpr const char *const MQTT_TARGET_HUMIDITY_COMMAND_TEMPLATE = "hum_cmd_tpl
 constexpr const char *const MQTT_TARGET_HUMIDITY_COMMAND_TOPIC = "hum_cmd_t";
 constexpr const char *const MQTT_TARGET_HUMIDITY_STATE_TEMPLATE = "hum_state_tpl";
 constexpr const char *const MQTT_TARGET_HUMIDITY_STATE_TOPIC = "hum_stat_t";
+constexpr const char *const MQTT_TARGET_TEMPERATURE_STEP = "temp_step";
 constexpr const char *const MQTT_TEMPERATURE_COMMAND_TEMPLATE = "temp_cmd_tpl";
 constexpr const char *const MQTT_TEMPERATURE_COMMAND_TOPIC = "temp_cmd_t";
 constexpr const char *const MQTT_TEMPERATURE_HIGH_COMMAND_TEMPLATE = "temp_hi_cmd_tpl";
@@ -313,6 +315,7 @@ constexpr const char *const MQTT_COMMAND_TOPIC = "command_topic";
 constexpr const char *const MQTT_CONFIGURATION_URL = "configuration_url";
 constexpr const char *const MQTT_CURRENT_HUMIDITY_TEMPLATE = "current_humidity_template";
 constexpr const char *const MQTT_CURRENT_HUMIDITY_TOPIC = "current_humidity_topic";
+constexpr const char *const MQTT_CURRENT_TEMPERATURE_STEP = "precision";
 constexpr const char *const MQTT_CURRENT_TEMPERATURE_TEMPLATE = "current_temperature_template";
 constexpr const char *const MQTT_CURRENT_TEMPERATURE_TOPIC = "current_temperature_topic";
 constexpr const char *const MQTT_DEVICE = "device";
@@ -494,6 +497,7 @@ constexpr const char *const MQTT_TARGET_HUMIDITY_COMMAND_TEMPLATE = "target_humi
 constexpr const char *const MQTT_TARGET_HUMIDITY_COMMAND_TOPIC = "target_humidity_command_topic";
 constexpr const char *const MQTT_TARGET_HUMIDITY_STATE_TEMPLATE = "target_humidity_state_template";
 constexpr const char *const MQTT_TARGET_HUMIDITY_STATE_TOPIC = "target_humidity_state_topic";
+constexpr const char *const MQTT_TARGET_TEMPERATURE_STEP = "temp_step";
 constexpr const char *const MQTT_TEMPERATURE_COMMAND_TEMPLATE = "temperature_command_template";
 constexpr const char *const MQTT_TEMPERATURE_COMMAND_TOPIC = "temperature_command_topic";
 constexpr const char *const MQTT_TEMPERATURE_HIGH_COMMAND_TEMPLATE = "temperature_high_command_template";
diff --git a/tests/components/mqtt/common.yaml b/tests/components/mqtt/common.yaml
index 5ed6335d65..e154be8b5c 100644
--- a/tests/components/mqtt/common.yaml
+++ b/tests/components/mqtt/common.yaml
@@ -200,6 +200,10 @@ climate:
     fan_only_cooling: true
     fan_with_cooling: true
     fan_with_heating: true
+    visual:
+      temperature_step:
+        target_temperature: 0.1
+        current_temperature: 0.1
 
 cover:
   - platform: template