[mitsubishi_cn105] Add C++ API for setting/clearing remote room temperature (#15558)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>

esphome/components/mitsubishi_cn105/climate.py

@@ -1,8 +1,11 @@
+from esphome import automation
 import esphome.codegen as cg
 from esphome.components import climate, uart
 import esphome.config_validation as cv
-from esphome.const import CONF_UPDATE_INTERVAL
-from esphome.types import ConfigType
+from esphome.const import CONF_ID, CONF_TEMPERATURE, CONF_UPDATE_INTERVAL
+from esphome.core import ID
+from esphome.cpp_generator import MockObj
+from esphome.types import ConfigType, TemplateArgsType
 
 DEPENDENCIES = ["uart"]
 AUTO_LOAD = ["climate"]
@@ -19,6 +22,18 @@ MitsubishiCN105Climate = mitsubishi_ns.class_(
     uart.UARTDevice,
 )
 
+SetRemoteTemperatureAction = mitsubishi_ns.class_(
+    "SetRemoteTemperatureAction",
+    automation.Action,
+    cg.Parented.template(MitsubishiCN105Climate),
+)
+
+ClearRemoteTemperatureAction = mitsubishi_ns.class_(
+    "ClearRemoteTemperatureAction",
+    automation.Action,
+    cg.Parented.template(MitsubishiCN105Climate),
+)
+
 CONFIG_SCHEMA = (
     climate.climate_schema(MitsubishiCN105Climate)
     .extend(uart.UART_DEVICE_SCHEMA)
@@ -53,3 +68,55 @@ async def to_code(config: ConfigType) -> None:
             config[CONF_CURRENT_TEMPERATURE_MIN_INTERVAL]
         )
     )
+
+
+@automation.register_action(
+    "climate.mitsubishi_cn105.set_remote_temperature",
+    SetRemoteTemperatureAction,
+    cv.Schema(
+        {
+            cv.Required(CONF_ID): cv.use_id(MitsubishiCN105Climate),
+            cv.Required(CONF_TEMPERATURE): cv.templatable(
+                cv.All(
+                    cv.temperature,
+                    cv.Range(min=8.0, max=39.5),
+                )
+            ),
+        }
+    ),
+    synchronous=True,
+)
+async def set_remote_temperature_action_to_code(
+    config: ConfigType,
+    action_id: ID,
+    template_arg: cg.TemplateArguments,
+    args: TemplateArgsType,
+) -> MockObj:
+    var = cg.new_Pvariable(action_id, template_arg)
+    await cg.register_parented(var, config[CONF_ID])
+
+    temperature = await cg.templatable(config[CONF_TEMPERATURE], args, float)
+    cg.add(var.set_temperature(temperature))
+
+    return var
+
+
+@automation.register_action(
+    "climate.mitsubishi_cn105.clear_remote_temperature",
+    ClearRemoteTemperatureAction,
+    cv.Schema(
+        {
+            cv.Required(CONF_ID): cv.use_id(MitsubishiCN105Climate),
+        }
+    ),
+    synchronous=True,
+)
+async def clear_remote_temperature_action_to_code(
+    config: ConfigType,
+    action_id: ID,
+    template_arg: cg.TemplateArguments,
+    args: TemplateArgsType,
+) -> MockObj:
+    var = cg.new_Pvariable(action_id, template_arg)
+    await cg.register_parented(var, config[CONF_ID])
+    return var

esphome/components/mitsubishi_cn105/mitsubishi_cn105.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <array>
 #include <cmath>
 #include <numeric>
@@ -92,6 +93,7 @@ void MitsubishiCN105::initialize() { this->set_state_(State::CONNECTING); }
 bool MitsubishiCN105::update() {
   if (const auto start = this->status_update_start_ms_) {
     if (this->pending_updates_.any()) {
+      this->status_update_wait_credit_ms_ = std::min(this->update_interval_ms_, get_loop_time_ms() - *start);
       this->cancel_waiting_and_transition_to_(State::APPLYING_SETTINGS);
       return false;
     }
@@ -105,6 +107,7 @@ bool MitsubishiCN105::update() {
   if (const auto start = this->write_timeout_start_ms_; start && (get_loop_time_ms() - *start) >= WRITE_TIMEOUT_MS) {
     this->write_timeout_start_ms_.reset();
     this->frame_parser_.reset();
+    this->status_update_wait_credit_ms_ = 0;
     this->set_state_(State::READ_TIMEOUT);
     return false;
   }
@@ -191,14 +194,14 @@ void MitsubishiCN105::did_transition_(State to) {
     }
 
     case State::SCHEDULE_NEXT_STATUS_UPDATE:
-      this->status_update_start_ms_ = get_loop_time_ms();
+      this->status_update_start_ms_ = get_loop_time_ms() - this->status_update_wait_credit_ms_;
+      this->status_update_wait_credit_ms_ = 0;
       this->current_status_msg_type_ = STATUS_MSG_SETTINGS;
       this->set_state_(State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
       break;
 
     case State::APPLYING_SETTINGS:
       this->apply_settings_();
-      this->pending_updates_.clear();
       break;
 
     case State::SETTINGS_APPLIED:
@@ -309,21 +312,21 @@ bool MitsubishiCN105::parse_status_settings_(const uint8_t *payload, size_t len)
     return false;
   }
 
-  if (!this->pending_updates_.has(UpdateFlag::POWER)) {
+  if (!this->pending_updates_.contains(UpdateFlag::POWER)) {
     this->status_.power_on = payload[2] != 0;
   }
 
   this->use_temperature_encoding_b_ = payload[10] != 0;
-  if (!this->pending_updates_.has(UpdateFlag::TEMPERATURE)) {
+  if (!this->pending_updates_.contains(UpdateFlag::TEMPERATURE)) {
     this->status_.target_temperature = decode_temperature(-payload[4], payload[10], TARGET_TEMPERATURE_ENC_A_OFFSET);
   }
 
-  if (!this->pending_updates_.has(UpdateFlag::MODE)) {
+  if (!this->pending_updates_.contains(UpdateFlag::MODE)) {
     const bool i_see = payload[3] > 0x08;
     this->status_.mode = lookup(PROTOCOL_MODE_MAP, payload[3] - (i_see ? 0x08 : 0)).value_or(Mode::UNKNOWN);
   }
 
-  if (!this->pending_updates_.has(UpdateFlag::FAN)) {
+  if (!this->pending_updates_.contains(UpdateFlag::FAN)) {
     this->status_.fan_mode = lookup(PROTOCOL_FAN_MODE_MAP, payload[5]).value_or(FanMode::UNKNOWN);
   }
 
@@ -342,6 +345,27 @@ bool MitsubishiCN105::parse_status_room_temperature_(const uint8_t *payload, siz
   return true;
 }
 
+void MitsubishiCN105::set_remote_temperature(float temperature) {
+  if (std::isnan(temperature)) {
+    ESP_LOGD(TAG, "Ignoring NaN remote temperature");
+    return;
+  }
+  if (temperature < 8.0f || temperature > 39.5f) {
+    ESP_LOGD(TAG, "Ignoring out-of-range remote temperature: %.1f", temperature);
+    return;
+  }
+  this->set_remote_temperature_half_deg_(static_cast<uint8_t>(std::round(temperature * 2.0f)));
+}
+
+void MitsubishiCN105::clear_remote_temperature() {
+  this->set_remote_temperature_half_deg_(REMOTE_TEMPERATURE_DISABLED);
+}
+
+void MitsubishiCN105::set_remote_temperature_half_deg_(uint8_t temperature_half_deg) {
+  this->remote_temperature_half_deg_ = temperature_half_deg;
+  this->pending_updates_.set(UpdateFlag::REMOTE_TEMPERATURE);
+}
+
 void MitsubishiCN105::set_power(bool power_on) {
   this->status_.power_on = power_on;
   this->pending_updates_.set(UpdateFlag::POWER);
@@ -377,30 +401,47 @@ void MitsubishiCN105::set_fan_mode(FanMode fan_mode) {
 }
 
 void MitsubishiCN105::apply_settings_() {
-  std::array<uint8_t, REQUEST_PAYLOAD_LEN> payload = {0x01};
+  std::array<uint8_t, REQUEST_PAYLOAD_LEN> payload{};
 
-  if (this->pending_updates_.has(UpdateFlag::POWER)) {
-    payload[1] |= 0x01;
-    payload[3] = this->status_.power_on ? 0x01 : 0x00;
-  }
-
-  if (this->pending_updates_.has(UpdateFlag::TEMPERATURE)) {
-    payload[1] |= 0x04;
-    if (this->use_temperature_encoding_b_) {
-      payload[14] = static_cast<uint8_t>(std::round(this->status_.target_temperature * 2.0f) + 128);
+  // Apply all other pending settings first; handle REMOTE_TEMPERATURE last
+  if (this->pending_updates_.contains_only(UpdateFlag::REMOTE_TEMPERATURE)) {
+    payload[0] = 0x07;
+    if (this->remote_temperature_half_deg_ == REMOTE_TEMPERATURE_DISABLED) {
+      payload[3] = 0x80;
     } else {
-      payload[5] = static_cast<uint8_t>(TARGET_TEMPERATURE_ENC_A_OFFSET - std::round(this->status_.target_temperature));
+      payload[1] = 0x01;
+      payload[2] = static_cast<uint8_t>(this->remote_temperature_half_deg_ - 16);
+      payload[3] = static_cast<uint8_t>(this->remote_temperature_half_deg_ + 128);
+    }
+    this->pending_updates_.clear(UpdateFlag::REMOTE_TEMPERATURE);
+  } else {
+    payload[0] = 0x01;
+    if (this->pending_updates_.contains(UpdateFlag::POWER)) {
+      payload[1] |= 0x01;
+      payload[3] = this->status_.power_on ? 0x01 : 0x00;
     }
-  }
 
-  if (this->pending_updates_.has(UpdateFlag::MODE) &&
-      reverse_lookup(PROTOCOL_MODE_MAP, this->status_.mode, payload[4])) {
-    payload[1] |= 0x02;
-  }
+    if (this->pending_updates_.contains(UpdateFlag::TEMPERATURE)) {
+      payload[1] |= 0x04;
+      if (this->use_temperature_encoding_b_) {
+        payload[14] = static_cast<uint8_t>(std::round(this->status_.target_temperature * 2.0f) + 128);
+      } else {
+        payload[5] =
+            static_cast<uint8_t>(TARGET_TEMPERATURE_ENC_A_OFFSET - std::round(this->status_.target_temperature));
+      }
+    }
 
-  if (this->pending_updates_.has(UpdateFlag::FAN) &&
-      reverse_lookup(PROTOCOL_FAN_MODE_MAP, this->status_.fan_mode, payload[6])) {
-    payload[1] |= 0x08;
+    if (this->pending_updates_.contains(UpdateFlag::MODE) &&
+        reverse_lookup(PROTOCOL_MODE_MAP, this->status_.mode, payload[4])) {
+      payload[1] |= 0x02;
+    }
+
+    if (this->pending_updates_.contains(UpdateFlag::FAN) &&
+        reverse_lookup(PROTOCOL_FAN_MODE_MAP, this->status_.fan_mode, payload[6])) {
+      payload[1] |= 0x08;
+    }
+
+    this->pending_updates_.clear(UpdateFlag::POWER, UpdateFlag::TEMPERATURE, UpdateFlag::MODE, UpdateFlag::FAN);
   }
 
   this->send_packet_(make_packet(PACKET_TYPE_WRITE_SETTINGS_REQUEST, payload));

esphome/components/mitsubishi_cn105/mitsubishi_cn105.h

@@ -2,6 +2,7 @@
 
 #include <optional>
 #include "esphome/components/uart/uart.h"
+#include "esphome/core/finite_set_mask.h"
 
 namespace esphome::mitsubishi_cn105 {
 
@@ -60,6 +61,8 @@ class MitsubishiCN105 {
   void set_target_temperature(float target_temperature);
   void set_mode(Mode mode);
   void set_fan_mode(FanMode fan_mode);
+  void set_remote_temperature(float temperature);
+  void clear_remote_temperature();
 
  protected:
   enum class State : uint8_t {
@@ -91,20 +94,25 @@ class MitsubishiCN105 {
   };
 
   enum class UpdateFlag : uint8_t {
-    TEMPERATURE = 1 << 0,
-    POWER = 1 << 1,
-    MODE = 1 << 2,
-    FAN = 1 << 3,
+    TEMPERATURE = 0,
+    POWER = 1,
+    MODE = 2,
+    FAN = 3,
+    REMOTE_TEMPERATURE = 4,
   };
 
   struct UpdateFlags {
-    void set(UpdateFlag f) { flags_ |= static_cast<uint8_t>(f); }
-    void clear() { flags_ = 0; }
-    bool any() const { return flags_ != 0; }
-    bool has(UpdateFlag f) const { return (flags_ & static_cast<uint8_t>(f)) != 0; }
+    template<typename... Flags> void set(Flags... flags) { (this->mask_.insert(flags), ...); }
+    template<typename... Flags> void clear(Flags... flags) { (this->mask_.erase(flags), ...); }
+    bool any() const { return !this->mask_.empty(); }
+    bool contains(UpdateFlag flag) const { return this->mask_.count(flag); }
+    bool contains_only(UpdateFlag flag) const { return this->mask_.get_mask() == Mask{flag}.get_mask(); }
 
    protected:
-    uint8_t flags_{0};
+    using Mask =
+        FiniteSetMask<UpdateFlag, DefaultBitPolicy<UpdateFlag, static_cast<int>(UpdateFlag::REMOTE_TEMPERATURE) + 1>>;
+
+    Mask mask_;
   };
 
   void set_state_(State new_state);
@@ -119,12 +127,14 @@ class MitsubishiCN105 {
   void cancel_waiting_and_transition_to_(State state);
   bool should_request_room_temperature_() const;
   void apply_settings_();
+  void set_remote_temperature_half_deg_(uint8_t temperature_half_deg);
   template<typename T> void send_packet_(const T &packet) { this->send_packet_(packet.data(), packet.size()); }
   static bool should_transition(State from, State to);
   static const LogString *state_to_string(State state);
 
   uart::UARTDevice &device_;
   uint32_t update_interval_ms_{1000};
+  uint32_t status_update_wait_credit_ms_{0};
   uint32_t room_temperature_min_interval_ms_{60000};
   std::optional<uint32_t> write_timeout_start_ms_;
   std::optional<uint32_t> status_update_start_ms_;
@@ -133,8 +143,11 @@ class MitsubishiCN105 {
   State state_{State::NOT_CONNECTED};
   UpdateFlags pending_updates_;
   bool use_temperature_encoding_b_{false};
-  uint8_t current_status_msg_type_{0};
   FrameParser frame_parser_;
+  uint8_t current_status_msg_type_{0};
+
+  static constexpr uint8_t REMOTE_TEMPERATURE_DISABLED = 0;
+  uint8_t remote_temperature_half_deg_{REMOTE_TEMPERATURE_DISABLED};
 };
 
 }  // namespace esphome::mitsubishi_cn105

esphome/components/mitsubishi_cn105/mitsubishi_cn105_climate.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "esphome/core/automation.h"
 #include "esphome/core/component.h"
 #include "esphome/components/climate/climate.h"
 #include "esphome/components/uart/uart.h"
@@ -18,8 +19,11 @@ class MitsubishiCN105Climate : public climate::Climate, public Component, public
   climate::ClimateTraits traits() override;
   void control(const climate::ClimateCall &call) override;
 
-  void set_update_interval(uint32_t ms) { hp_.set_update_interval(ms); }
-  void set_current_temperature_min_interval(uint32_t ms) { hp_.set_room_temperature_min_interval(ms); }
+  void set_update_interval(uint32_t ms) { this->hp_.set_update_interval(ms); }
+  void set_current_temperature_min_interval(uint32_t ms) { this->hp_.set_room_temperature_min_interval(ms); }
+
+  void set_remote_temperature(float temperature) { this->hp_.set_remote_temperature(temperature); }
+  void clear_remote_temperature() { this->hp_.clear_remote_temperature(); }
 
  protected:
   void apply_values_();
@@ -27,4 +31,18 @@ class MitsubishiCN105Climate : public climate::Climate, public Component, public
   MitsubishiCN105 hp_;
 };
 
+template<typename... Ts>
+class SetRemoteTemperatureAction : public Action<Ts...>, public Parented<MitsubishiCN105Climate> {
+ public:
+  TEMPLATABLE_VALUE(float, temperature)
+
+  void play(const Ts &...x) override { this->parent_->set_remote_temperature(this->temperature_.value(x...)); }
+};
+
+template<typename... Ts>
+class ClearRemoteTemperatureAction : public Action<Ts...>, public Parented<MitsubishiCN105Climate> {
+ public:
+  void play(const Ts &...x) override { this->parent_->clear_remote_temperature(); }
+};
+
 }  // namespace esphome::mitsubishi_cn105

tests/components/mitsubishi_cn105/climate/mitsubishi_cn105_tests.cpp

@@ -375,14 +375,22 @@ TEST(MitsubishiCN105Tests, ApplyFanModeSpeed1) {
 TEST(MitsubishiCN105Tests, WriteInterruptsWaitingForNextStatusUpdate) {
   auto ctx = TestContext{};
 
+  ctx.sut.set_update_interval(2000);
+  ctx.sut.set_current_time(5000);
+
   // Waiting for next scheduled status update
   ctx.sut.state_ = TestableMitsubishiCN105::State::STATUS_UPDATED;
   ctx.sut.set_state(TestableMitsubishiCN105::State::SCHEDULE_NEXT_STATUS_UPDATE);
   EXPECT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
+  EXPECT_EQ(ctx.sut.status_update_start_ms_, std::optional<uint32_t>{5000});
+  EXPECT_EQ(ctx.sut.status_update_wait_credit_ms_, 0);
 
   // Nothing to do in update (rx empty, no timeout)
+  ctx.sut.set_current_time(5500);
   ASSERT_FALSE(ctx.sut.update());
   EXPECT_TRUE(ctx.uart.tx.empty());
+  EXPECT_EQ(ctx.sut.status_update_start_ms_, std::optional<uint32_t>{5000});
+  EXPECT_EQ(ctx.sut.status_update_wait_credit_ms_, 0);
 
   // Write new values
   ctx.sut.use_temperature_encoding_b_ = true;
@@ -392,11 +400,52 @@ TEST(MitsubishiCN105Tests, WriteInterruptsWaitingForNextStatusUpdate) {
   ctx.sut.set_fan_mode(MitsubishiCN105::FanMode::AUTO);
 
   // Waiting for next status update must be interrupted and new values send to AC
+  ctx.sut.set_current_time(6000);
   ASSERT_FALSE(ctx.sut.update());
+  EXPECT_FALSE(ctx.sut.status_update_start_ms_.has_value());
+  EXPECT_EQ(ctx.sut.status_update_wait_credit_ms_, 1000);
   EXPECT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::APPLYING_SETTINGS);
   EXPECT_THAT(ctx.uart.tx, ::testing::ElementsAre(0xFC, 0x41, 0x01, 0x30, 0x10, 0x01, 0x0F, 0x00, 0x00, 0x01, 0x00,
                                                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xB2, 0x00, 0xBB));
 
+  // Write ACK response
+  ctx.uart.push_rx({0xFC, 0x61, 0x01, 0x30, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5E});
+  ctx.sut.set_current_time(6500);
+  ASSERT_FALSE(ctx.sut.update());
+  EXPECT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
+  EXPECT_EQ(ctx.sut.status_update_start_ms_, std::optional<uint32_t>{6500 - 1000});
+  EXPECT_EQ(ctx.sut.status_update_wait_credit_ms_, 0);
+}
+
+TEST(MitsubishiCN105Tests, SetAndClearRemoteRoomTemp) {
+  auto ctx = TestContext{};
+
+  // Set remote temperature
+  ctx.sut.set_remote_temperature(28.5f);
+
+  ctx.sut.state_ = TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE;
+  ctx.sut.set_state(TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+
+  EXPECT_THAT(ctx.uart.tx, ::testing::ElementsAre(0xFC, 0x41, 0x01, 0x30, 0x10, 0x07, 0x01, 0x29, 0xB9, 0x00, 0x00,
+                                                  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x94));
+
+  // Write ACK response
+  ctx.uart.push_rx({0xFC, 0x61, 0x01, 0x30, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5E});
+  ASSERT_FALSE(ctx.sut.update());
+  EXPECT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
+
+  ctx.uart.tx.clear();
+
+  // Clear remote temperature
+  ctx.sut.clear_remote_temperature();
+
+  ctx.sut.set_state(TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+
+  EXPECT_THAT(ctx.uart.tx, ::testing::ElementsAre(0xFC, 0x41, 0x01, 0x30, 0x10, 0x07, 0x00, 0x00, 0x80, 0x00, 0x00,
+                                                  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF7));
+
   // Write ACK response
   ctx.uart.push_rx({0xFC, 0x61, 0x01, 0x30, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5E});
@@ -404,4 +453,102 @@ TEST(MitsubishiCN105Tests, WriteInterruptsWaitingForNextStatusUpdate) {
   EXPECT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
 }
 
+TEST(MitsubishiCN105Tests, ApplyQueuedSettingsThenRemoteRoomTempInSecondWrite) {
+  auto ctx = TestContext{};
+
+  // Queue normal settings plus remote temperature together.
+  ctx.sut.use_temperature_encoding_b_ = true;
+  ctx.sut.set_power(false);
+  ctx.sut.set_target_temperature(25.0f);
+  ctx.sut.set_mode(MitsubishiCN105::Mode::HEAT);
+  ctx.sut.set_fan_mode(MitsubishiCN105::FanMode::AUTO);
+  ctx.sut.set_remote_temperature(28.5f);
+
+  // First apply sends only the normal settings write.
+  ctx.sut.state_ = TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE;
+  ctx.sut.set_state(TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+
+  EXPECT_THAT(ctx.uart.tx, ::testing::ElementsAre(0xFC, 0x41, 0x01, 0x30, 0x10, 0x01, 0x0F, 0x00, 0x00, 0x01, 0x00,
+                                                  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xB2, 0x00, 0xBB));
+  EXPECT_TRUE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::POWER));
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::TEMPERATURE));
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::MODE));
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::FAN));
+
+  // ACK the first write. Remote temperature should still be pending afterward.
+  ctx.uart.tx.clear();
+  ctx.uart.push_rx({0xFC, 0x61, 0x01, 0x30, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5E});
+  ASSERT_FALSE(ctx.sut.update());
+
+  EXPECT_TRUE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+
+  // The next apply sends the remote-temperature packet and clears the last pending flag.
+  ctx.uart.tx.clear();
+  ctx.sut.set_state(TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+
+  EXPECT_THAT(ctx.uart.tx, ::testing::ElementsAre(0xFC, 0x41, 0x01, 0x30, 0x10, 0x07, 0x01, 0x29, 0xB9, 0x00, 0x00,
+                                                  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x94));
+  EXPECT_FALSE(ctx.sut.pending_updates_.any());
+}
+
+TEST(MitsubishiCN105Tests, WriteTimeoutClearsStatusUpdateWaitCreditOnReconnect) {
+  auto ctx = TestContext{};
+  ctx.sut.set_update_interval(2000);
+  ctx.sut.set_current_time(5000);
+
+  // Start in the scheduled status update wait state.
+  ctx.sut.state_ = TestableMitsubishiCN105::State::STATUS_UPDATED;
+  ctx.sut.set_state(TestableMitsubishiCN105::State::SCHEDULE_NEXT_STATUS_UPDATE);
+  ASSERT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::WAITING_FOR_SCHEDULED_STATUS_UPDATE);
+  ASSERT_EQ(ctx.sut.status_update_start_ms_, std::optional<uint32_t>{5000});
+  ASSERT_EQ(ctx.sut.status_update_wait_credit_ms_, 0);
+
+  // Interrupt that wait with a write so credit is accumulated.
+  ctx.sut.use_temperature_encoding_b_ = true;
+  ctx.sut.set_power(false);
+  ctx.sut.set_target_temperature(25.0f);
+  ctx.sut.set_mode(MitsubishiCN105::Mode::HEAT);
+  ctx.sut.set_fan_mode(MitsubishiCN105::FanMode::AUTO);
+  ctx.sut.set_current_time(6000);
+  ASSERT_FALSE(ctx.sut.update());
+  ASSERT_EQ(ctx.sut.state_, TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+  ASSERT_FALSE(ctx.sut.status_update_start_ms_.has_value());
+  ASSERT_EQ(ctx.sut.status_update_wait_credit_ms_, 1000);
+
+  // Do not ACK the write. Advance time far enough to force timeout/reconnect
+  // handling and verify that stale wait credit is cleared during recovery.
+  ctx.sut.set_current_time(36000);
+  ASSERT_FALSE(ctx.sut.update());
+  EXPECT_NE(ctx.sut.state_, TestableMitsubishiCN105::State::APPLYING_SETTINGS);
+  EXPECT_EQ(ctx.sut.status_update_wait_credit_ms_, 0);
+  EXPECT_FALSE(ctx.sut.status_update_start_ms_.has_value());
+}
+
+TEST(MitsubishiCN105Tests, SetOutOfRangeRemoteRoomTempIsIgnored) {
+  auto ctx = TestContext{};
+
+  ctx.sut.set_remote_temperature(7.0f);
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+
+  ctx.sut.set_remote_temperature(40.0f);
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+
+  ctx.sut.set_remote_temperature(NAN);
+  EXPECT_FALSE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+}
+
+TEST(MitsubishiCN105Tests, SetMinRemoteRoomTemp) {
+  auto ctx = TestContext{};
+  ctx.sut.set_remote_temperature(8.0f);
+  EXPECT_TRUE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+}
+
+TEST(MitsubishiCN105Tests, SetMaxRemoteRoomTemp) {
+  auto ctx = TestContext{};
+  ctx.sut.set_remote_temperature(39.5f);
+  EXPECT_TRUE(ctx.sut.pending_updates_.contains(TestableMitsubishiCN105::UpdateFlag::REMOTE_TEMPERATURE));
+}
+
 }  // namespace esphome::mitsubishi_cn105::testing

tests/components/mitsubishi_cn105/common.h

@@ -42,10 +42,13 @@ class TestableMitsubishiCN105 : public MitsubishiCN105 {
  public:
   using MitsubishiCN105::MitsubishiCN105;
   using MitsubishiCN105::State;
+  using MitsubishiCN105::UpdateFlag;
   using MitsubishiCN105::state_;
   using MitsubishiCN105::write_timeout_start_ms_;
   using MitsubishiCN105::status_update_start_ms_;
   using MitsubishiCN105::use_temperature_encoding_b_;
+  using MitsubishiCN105::status_update_wait_credit_ms_;
+  using MitsubishiCN105::pending_updates_;
 
   void set_state(State s) { this->set_state_(s); }
   void apply_settings() { this->apply_settings_(); }

tests/components/mitsubishi_cn105/common.yaml

@@ -1,4 +1,14 @@
 climate:
   - platform: mitsubishi_cn105
+    id: ac
     name: "AC Test"
     uart_id: uart_bus
+
+esphome:
+  on_boot:
+    then:
+      - climate.mitsubishi_cn105.set_remote_temperature:
+          id: ac
+          temperature: 22.0
+      - climate.mitsubishi_cn105.clear_remote_temperature:
+          id: ac