From 4b143e1f3da9ac4fb225082e8505726677fa491c Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 21:54:05 -0600
Subject: [PATCH 1/8] Add ble_client lambda compile tests

---
 tests/components/ble_client/common.yaml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tests/components/ble_client/common.yaml b/tests/components/ble_client/common.yaml
index aa4b639463..4ea1dd60f3 100644
--- a/tests/components/ble_client/common.yaml
+++ b/tests/components/ble_client/common.yaml
@@ -52,3 +52,25 @@ sensor:
     name: "BLE Sensor without Lambda"
     service_uuid: "abcd1234-abcd-1234-abcd-abcd12345678"
     characteristic_uuid: "abcd1237-abcd-1234-abcd-abcd12345678"
+
+number:
+  - platform: template
+    name: "Test Number"
+    id: test_number
+    optimistic: true
+    min_value: 0
+    max_value: 255
+    step: 1
+
+button:
+  # Test ble_write with lambda that references a component (function pointer)
+  - platform: template
+    name: "BLE Write Lambda Test"
+    on_press:
+      - ble_client.ble_write:
+          id: test_blec
+          service_uuid: "abcd1234-abcd-1234-abcd-abcd12345678"
+          characteristic_uuid: "abcd1235-abcd-1234-abcd-abcd12345678"
+          value: !lambda |-
+            uint8_t val = (uint8_t)id(test_number).state;
+            return std::vector<uint8_t>{0xAA, val, 0xBB};

From dad5a88ecf8edb8c4982ad3efcc23ca87cef708a Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:03:54 -0600
Subject: [PATCH 2/8] [canbus] Optimize canbus.send memory usage - store static
 data in flash

---
 esphome/components/canbus/__init__.py |  7 +++++--
 esphome/components/canbus/canbus.h    | 30 ++++++++++++++++++---------
 tests/components/canbus/common.yaml   | 13 ++++++++++++
 3 files changed, 38 insertions(+), 12 deletions(-)

diff --git a/esphome/components/canbus/__init__.py b/esphome/components/canbus/__init__.py
index e1de1eb2f2..7b51c2c45c 100644
--- a/esphome/components/canbus/__init__.py
+++ b/esphome/components/canbus/__init__.py
@@ -4,7 +4,7 @@ from esphome import automation
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.const import CONF_DATA, CONF_ID, CONF_TRIGGER_ID
-from esphome.core import CORE
+from esphome.core import CORE, ID
 
 CODEOWNERS = ["@mvturnho", "@danielschramm"]
 IS_PLATFORM_COMPONENT = True
@@ -176,5 +176,8 @@ async def canbus_action_to_code(config, action_id, template_arg, args):
     else:
         if isinstance(data, bytes):
             data = [int(x) for x in data]
-        cg.add(var.set_data_static(data))
+        # Generate static array in flash to avoid RAM copy
+        arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
+        arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data))
+        cg.add(var.set_data_static(arr, len(data)))
     return var
diff --git a/esphome/components/canbus/canbus.h b/esphome/components/canbus/canbus.h
index 029eb278c0..122ccfe39e 100644
--- a/esphome/components/canbus/canbus.h
+++ b/esphome/components/canbus/canbus.h
@@ -112,12 +112,16 @@ class Canbus : public Component {
 
 template<typename... Ts> class CanbusSendAction : public Action<Ts...>, public Parented<Canbus> {
  public:
-  void set_data_template(const std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    // Stateless lambdas (generated by ESPHome) implicitly convert to function pointers
+    this->data_.func = func;
     this->static_ = false;
   }
-  void set_data_static(const std::vector<uint8_t> &data) {
-    this->data_static_ = data;
+
+  // Store pointer to static data in flash (no RAM copy)
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
     this->static_ = true;
   }
 
@@ -133,21 +137,27 @@ template<typename... Ts> class CanbusSendAction : public Action<Ts...>, public P
     auto can_id = this->can_id_.has_value() ? *this->can_id_ : this->parent_->can_id_;
     auto use_extended_id =
         this->use_extended_id_.has_value() ? *this->use_extended_id_ : this->parent_->use_extended_id_;
+    std::vector<uint8_t> data;
     if (this->static_) {
-      this->parent_->send_data(can_id, use_extended_id, this->remote_transmission_request_, this->data_static_);
+      data.assign(this->data_.static_data.ptr, this->data_.static_data.ptr + this->data_.static_data.len);
     } else {
-      auto val = this->data_func_(x...);
-      this->parent_->send_data(can_id, use_extended_id, this->remote_transmission_request_, val);
+      data = this->data_.func(x...);
     }
+    this->parent_->send_data(can_id, use_extended_id, this->remote_transmission_request_, data);
   }
 
  protected:
   optional<uint32_t> can_id_{};
   optional<bool> use_extended_id_{};
   bool remote_transmission_request_{false};
-  bool static_{false};
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
+  bool static_{true};  // Default to static mode (most common case)
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);  // 4 bytes on 32-bit
+    struct {
+      const uint8_t *ptr;  // 4 bytes on 32-bit
+      size_t len;          // 4 bytes on 32-bit
+    } static_data;         // 8 bytes total on 32-bit
+  } data_;                 // Union size = 8 bytes (max of 4 and 8)
 };
 
 class CanbusTrigger : public Trigger<std::vector<uint8_t>, uint32_t, bool>, public Component {
diff --git a/tests/components/canbus/common.yaml b/tests/components/canbus/common.yaml
index fd146cc3a3..8bddeb7409 100644
--- a/tests/components/canbus/common.yaml
+++ b/tests/components/canbus/common.yaml
@@ -37,6 +37,15 @@ canbus:
                   break;
               }
 
+number:
+  - platform: template
+    name: "Test Number"
+    id: test_number
+    optimistic: true
+    min_value: 0
+    max_value: 255
+    step: 1
+
 button:
   - platform: template
     name: Canbus Actions
@@ -44,3 +53,7 @@ button:
       - canbus.send: "abc"
       - canbus.send: [0, 1, 2]
       - canbus.send: !lambda return {0, 1, 2};
+      # Test canbus.send with lambda that references a component (function pointer)
+      - canbus.send: !lambda |-
+          uint8_t val = (uint8_t)id(test_number).state;
+          return std::vector<uint8_t>{0xAA, val, 0xBB};

From 93a57831f40ffacc394b9c14aa5dd60e087ac1aa Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:08:07 -0600
Subject: [PATCH 3/8] Add additional compile time tests for canbus

---
 tests/components/canbus/common.yaml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tests/components/canbus/common.yaml b/tests/components/canbus/common.yaml
index fd146cc3a3..8bddeb7409 100644
--- a/tests/components/canbus/common.yaml
+++ b/tests/components/canbus/common.yaml
@@ -37,6 +37,15 @@ canbus:
                   break;
               }
 
+number:
+  - platform: template
+    name: "Test Number"
+    id: test_number
+    optimistic: true
+    min_value: 0
+    max_value: 255
+    step: 1
+
 button:
   - platform: template
     name: Canbus Actions
@@ -44,3 +53,7 @@ button:
       - canbus.send: "abc"
       - canbus.send: [0, 1, 2]
       - canbus.send: !lambda return {0, 1, 2};
+      # Test canbus.send with lambda that references a component (function pointer)
+      - canbus.send: !lambda |-
+          uint8_t val = (uint8_t)id(test_number).state;
+          return std::vector<uint8_t>{0xAA, val, 0xBB};

From 17df00809216a7505d9fbf12ed6e66d19d93bdf2 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:16:39 -0600
Subject: [PATCH 4/8] [sx126x] Optimize send_packet action memory usage - store
 static data in flash

---
 esphome/components/sx126x/__init__.py  |  7 +++++--
 esphome/components/sx126x/automation.h | 26 +++++++++++++++++---------
 tests/components/sx126x/common.yaml    | 11 +++++++++++
 3 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/esphome/components/sx126x/__init__.py b/esphome/components/sx126x/__init__.py
index 370cd102d4..f8f3b9d104 100644
--- a/esphome/components/sx126x/__init__.py
+++ b/esphome/components/sx126x/__init__.py
@@ -3,7 +3,7 @@ import esphome.codegen as cg
 from esphome.components import spi
 import esphome.config_validation as cv
 from esphome.const import CONF_BUSY_PIN, CONF_DATA, CONF_FREQUENCY, CONF_ID
-from esphome.core import TimePeriod
+from esphome.core import ID, TimePeriod
 
 MULTI_CONF = True
 CODEOWNERS = ["@swoboda1337"]
@@ -329,5 +329,8 @@ async def send_packet_action_to_code(config, action_id, template_arg, args):
         templ = await cg.templatable(data, args, cg.std_vector.template(cg.uint8))
         cg.add(var.set_data_template(templ))
     else:
-        cg.add(var.set_data_static(data))
+        # Generate static array in flash to avoid RAM copy
+        arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
+        arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data))
+        cg.add(var.set_data_static(arr, len(data)))
     return var
diff --git a/esphome/components/sx126x/automation.h b/esphome/components/sx126x/automation.h
index 6b2371e253..41f0a888e5 100644
--- a/esphome/components/sx126x/automation.h
+++ b/esphome/components/sx126x/automation.h
@@ -14,28 +14,36 @@ template<typename... Ts> class RunImageCalAction : public Action<Ts...>, public
 
 template<typename... Ts> class SendPacketAction : public Action<Ts...>, public Parented<SX126x> {
  public:
-  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    this->data_.func = func;
     this->static_ = false;
   }
 
-  void set_data_static(const std::vector<uint8_t> &data) {
-    this->data_static_ = data;
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
     this->static_ = true;
   }
 
   void play(const Ts &...x) override {
+    std::vector<uint8_t> data;
     if (this->static_) {
-      this->parent_->transmit_packet(this->data_static_);
+      data.assign(this->data_.static_data.ptr, this->data_.static_data.ptr + this->data_.static_data.len);
     } else {
-      this->parent_->transmit_packet(this->data_func_(x...));
+      data = this->data_.func(x...);
     }
+    this->parent_->transmit_packet(data);
   }
 
  protected:
-  bool static_{false};
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
+  bool static_{true};
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);
+    struct {
+      const uint8_t *ptr;
+      size_t len;
+    } static_data;
+  } data_;
 };
 
 template<typename... Ts> class SetModeTxAction : public Action<Ts...>, public Parented<SX126x> {
diff --git a/tests/components/sx126x/common.yaml b/tests/components/sx126x/common.yaml
index 3f540a4bae..659550cc01 100644
--- a/tests/components/sx126x/common.yaml
+++ b/tests/components/sx126x/common.yaml
@@ -26,6 +26,15 @@ sx126x:
       - lambda: |-
           ESP_LOGD("lambda", "packet %.2f %.2f %s", rssi, snr, format_hex(x).c_str());
 
+number:
+  - platform: template
+    name: "SX126x Number"
+    id: my_number
+    optimistic: true
+    min_value: 0
+    max_value: 100
+    step: 1
+
 button:
   - platform: template
     name: "SX126x Button"
@@ -37,3 +46,5 @@ button:
         - sx126x.set_mode_rx
         - sx126x.send_packet:
             data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]
+        - sx126x.send_packet: !lambda |-
+            return {0x01, 0x02, (uint8_t)id(my_number).state};

From ba82d968eb40372103f1e9b9844972e5ada95848 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:25:41 -0600
Subject: [PATCH 5/8] [sx127x] Optimize send_packet action memory usage - store
 static data in flash

---
 esphome/components/sx127x/__init__.py  |  6 +++++-
 esphome/components/sx127x/automation.h | 26 +++++++++++++++++---------
 tests/components/sx127x/common.yaml    | 11 +++++++++++
 3 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/esphome/components/sx127x/__init__.py b/esphome/components/sx127x/__init__.py
index 33b556db07..77cb61f7f8 100644
--- a/esphome/components/sx127x/__init__.py
+++ b/esphome/components/sx127x/__init__.py
@@ -3,6 +3,7 @@ import esphome.codegen as cg
 from esphome.components import spi
 import esphome.config_validation as cv
 from esphome.const import CONF_DATA, CONF_FREQUENCY, CONF_ID
+from esphome.core import ID
 
 MULTI_CONF = True
 CODEOWNERS = ["@swoboda1337"]
@@ -321,5 +322,8 @@ async def send_packet_action_to_code(config, action_id, template_arg, args):
         templ = await cg.templatable(data, args, cg.std_vector.template(cg.uint8))
         cg.add(var.set_data_template(templ))
     else:
-        cg.add(var.set_data_static(data))
+        # Generate static array in flash to avoid RAM copy
+        arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
+        arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data))
+        cg.add(var.set_data_static(arr, len(data)))
     return var
diff --git a/esphome/components/sx127x/automation.h b/esphome/components/sx127x/automation.h
index eae16c11fa..52dbf37e09 100644
--- a/esphome/components/sx127x/automation.h
+++ b/esphome/components/sx127x/automation.h
@@ -14,28 +14,36 @@ template<typename... Ts> class RunImageCalAction : public Action<Ts...>, public
 
 template<typename... Ts> class SendPacketAction : public Action<Ts...>, public Parented<SX127x> {
  public:
-  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    this->data_.func = func;
     this->static_ = false;
   }
 
-  void set_data_static(const std::vector<uint8_t> &data) {
-    this->data_static_ = data;
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
     this->static_ = true;
   }
 
   void play(const Ts &...x) override {
+    std::vector<uint8_t> data;
     if (this->static_) {
-      this->parent_->transmit_packet(this->data_static_);
+      data.assign(this->data_.static_data.ptr, this->data_.static_data.ptr + this->data_.static_data.len);
     } else {
-      this->parent_->transmit_packet(this->data_func_(x...));
+      data = this->data_.func(x...);
     }
+    this->parent_->transmit_packet(data);
   }
 
  protected:
-  bool static_{false};
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
+  bool static_{true};
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);
+    struct {
+      const uint8_t *ptr;
+      size_t len;
+    } static_data;
+  } data_;
 };
 
 template<typename... Ts> class SetModeTxAction : public Action<Ts...>, public Parented<SX127x> {
diff --git a/tests/components/sx127x/common.yaml b/tests/components/sx127x/common.yaml
index 540381fc08..6e48952fcc 100644
--- a/tests/components/sx127x/common.yaml
+++ b/tests/components/sx127x/common.yaml
@@ -26,6 +26,15 @@ sx127x:
       - sx127x.send_packet:
           data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]
 
+number:
+  - platform: template
+    name: "SX127x Number"
+    id: my_number
+    optimistic: true
+    min_value: 0
+    max_value: 100
+    step: 1
+
 button:
   - platform: template
     name: "SX127x Button"
@@ -38,3 +47,5 @@ button:
         - sx127x.set_mode_rx
         - sx127x.send_packet:
             data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]
+        - sx127x.send_packet: !lambda |-
+            return {0x01, 0x02, (uint8_t)id(my_number).state};

From 2cac99dafaf7e3972127f3d22bec94ebe6634db8 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:32:47 -0600
Subject: [PATCH 6/8] [udp] Optimize udp.write action memory usage - store
 static data in flash

---
 esphome/components/udp/__init__.py  |  7 +++++--
 esphome/components/udp/automation.h | 25 ++++++++++++++++---------
 tests/components/udp/common.yaml    | 19 +++++++++++++++++++
 3 files changed, 40 insertions(+), 11 deletions(-)

diff --git a/esphome/components/udp/__init__.py b/esphome/components/udp/__init__.py
index 6b1e4f8ed8..69abf4b989 100644
--- a/esphome/components/udp/__init__.py
+++ b/esphome/components/udp/__init__.py
@@ -12,7 +12,7 @@ from esphome.components.packet_transport import (
 )
 import esphome.config_validation as cv
 from esphome.const import CONF_DATA, CONF_ID, CONF_PORT, CONF_TRIGGER_ID
-from esphome.core import Lambda
+from esphome.core import ID, Lambda
 from esphome.cpp_generator import ExpressionStatement, MockObj
 
 CODEOWNERS = ["@clydebarrow"]
@@ -158,5 +158,8 @@ async def udp_write_to_code(config, action_id, template_arg, args):
         templ = await cg.templatable(data, args, cg.std_vector.template(cg.uint8))
         cg.add(var.set_data_template(templ))
     else:
-        cg.add(var.set_data_static(data))
+        # Generate static array in flash to avoid RAM copy
+        arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
+        arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data))
+        cg.add(var.set_data_static(arr, len(data)))
     return var
diff --git a/esphome/components/udp/automation.h b/esphome/components/udp/automation.h
index c5e5e2eae8..a3b76fb4ea 100644
--- a/esphome/components/udp/automation.h
+++ b/esphome/components/udp/automation.h
@@ -11,28 +11,35 @@ namespace udp {
 
 template<typename... Ts> class UDPWriteAction : public Action<Ts...>, public Parented<UDPComponent> {
  public:
-  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    this->data_.func = func;
     this->static_ = false;
   }
-  void set_data_static(const std::vector<uint8_t> &data) {
-    this->data_static_ = data;
+
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
     this->static_ = true;
   }
 
   void play(const Ts &...x) override {
     if (this->static_) {
-      this->parent_->send_packet(this->data_static_);
+      this->parent_->send_packet(this->data_.static_data.ptr, this->data_.static_data.len);
     } else {
-      auto val = this->data_func_(x...);
+      auto val = this->data_.func(x...);
       this->parent_->send_packet(val);
     }
   }
 
  protected:
-  bool static_{false};
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
+  bool static_{true};
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);
+    struct {
+      const uint8_t *ptr;
+      size_t len;
+    } static_data;
+  } data_;
 };
 
 }  // namespace udp
diff --git a/tests/components/udp/common.yaml b/tests/components/udp/common.yaml
index 96224d0d1f..98546d49ef 100644
--- a/tests/components/udp/common.yaml
+++ b/tests/components/udp/common.yaml
@@ -17,3 +17,22 @@ udp:
         id: my_udp
         data: !lambda |-
           return std::vector<uint8_t>{1,3,4,5,6};
+
+number:
+  - platform: template
+    name: "UDP Number"
+    id: my_number
+    optimistic: true
+    min_value: 0
+    max_value: 100
+    step: 1
+
+button:
+  - platform: template
+    name: "UDP Button"
+    on_press:
+      then:
+        - udp.write:
+            data: [0x01, 0x02, 0x03]
+        - udp.write: !lambda |-
+            return {0x10, 0x20, (uint8_t)id(my_number).state};

From ecf7de7743c15981b4592d6a1425101a03198202 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:39:51 -0600
Subject: [PATCH 7/8] [speaker] Optimize speaker.play action memory usage -
 store static data in flash

---
 esphome/components/speaker/__init__.py  |  7 +++++--
 esphome/components/speaker/automation.h | 25 ++++++++++++++++---------
 tests/components/speaker/common.yaml    | 18 ++++++++++++++++++
 3 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/esphome/components/speaker/__init__.py b/esphome/components/speaker/__init__.py
index 5f1ba94ee6..18e1d9782c 100644
--- a/esphome/components/speaker/__init__.py
+++ b/esphome/components/speaker/__init__.py
@@ -3,7 +3,7 @@ import esphome.codegen as cg
 from esphome.components import audio, audio_dac
 import esphome.config_validation as cv
 from esphome.const import CONF_DATA, CONF_ID, CONF_VOLUME
-from esphome.core import CORE
+from esphome.core import CORE, ID
 from esphome.coroutine import CoroPriority, coroutine_with_priority
 
 AUTO_LOAD = ["audio"]
@@ -90,7 +90,10 @@ async def speaker_play_action(config, action_id, template_arg, args):
         templ = await cg.templatable(data, args, cg.std_vector.template(cg.uint8))
         cg.add(var.set_data_template(templ))
     else:
-        cg.add(var.set_data_static(data))
+        # Generate static array in flash to avoid RAM copy
+        arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
+        arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data))
+        cg.add(var.set_data_static(arr, len(data)))
     return var
 
 
diff --git a/esphome/components/speaker/automation.h b/esphome/components/speaker/automation.h
index 80bba25030..cae429cf8a 100644
--- a/esphome/components/speaker/automation.h
+++ b/esphome/components/speaker/automation.h
@@ -10,28 +10,35 @@ namespace speaker {
 
 template<typename... Ts> class PlayAction : public Action<Ts...>, public Parented<Speaker> {
  public:
-  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    this->data_.func = func;
     this->static_ = false;
   }
-  void set_data_static(const std::vector<uint8_t> &data) {
-    this->data_static_ = data;
+
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
     this->static_ = true;
   }
 
   void play(const Ts &...x) override {
     if (this->static_) {
-      this->parent_->play(this->data_static_);
+      this->parent_->play(this->data_.static_data.ptr, this->data_.static_data.len);
     } else {
-      auto val = this->data_func_(x...);
+      auto val = this->data_.func(x...);
       this->parent_->play(val);
     }
   }
 
  protected:
-  bool static_{false};
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
+  bool static_{true};
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);
+    struct {
+      const uint8_t *ptr;
+      size_t len;
+    } static_data;
+  } data_;
 };
 
 template<typename... Ts> class VolumeSetAction : public Action<Ts...>, public Parented<Speaker> {
diff --git a/tests/components/speaker/common.yaml b/tests/components/speaker/common.yaml
index c04674ee29..fa54fa7e39 100644
--- a/tests/components/speaker/common.yaml
+++ b/tests/components/speaker/common.yaml
@@ -1,3 +1,12 @@
+number:
+  - platform: template
+    name: "Speaker Number"
+    id: my_number
+    optimistic: true
+    min_value: 0
+    max_value: 100
+    step: 1
+
 esphome:
   on_boot:
     then:
@@ -14,6 +23,15 @@ esphome:
             - speaker.finish:
       - speaker.stop:
 
+button:
+  - platform: template
+    name: "Speaker Button"
+    on_press:
+      then:
+        - speaker.play: [0x10, 0x20, 0x30, 0x40]
+        - speaker.play: !lambda |-
+            return {0x01, 0x02, (uint8_t)id(my_number).state};
+
 i2s_audio:
   i2s_lrclk_pin: ${i2s_bclk_pin}
   i2s_bclk_pin: ${i2s_lrclk_pin}

From a239460724a9a6787f69b9061f3252be5b313ed2 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 8 Nov 2025 22:48:50 -0600
Subject: [PATCH 8/8] [remote_base] Optimize abbwelcome action memory usage -
 store static data in flash

---
 esphome/components/remote_base/__init__.py    |  6 ++--
 .../remote_base/abbwelcome_protocol.h         | 31 +++++++++++++------
 .../remote_transmitter/common-buttons.yaml    | 25 +++++++++++++++
 3 files changed, 50 insertions(+), 12 deletions(-)

diff --git a/esphome/components/remote_base/__init__.py b/esphome/components/remote_base/__init__.py
index 8d735ea563..d24d24b000 100644
--- a/esphome/components/remote_base/__init__.py
+++ b/esphome/components/remote_base/__init__.py
@@ -39,7 +39,7 @@ from esphome.const import (
     CONF_WAND_ID,
     CONF_ZERO,
 )
-from esphome.core import coroutine
+from esphome.core import ID, coroutine
 from esphome.schema_extractors import SCHEMA_EXTRACT, schema_extractor
 from esphome.util import Registry, SimpleRegistry
 
@@ -2104,7 +2104,9 @@ async def abbwelcome_action(var, config, args):
             )
             cg.add(var.set_data_template(template_))
         else:
-            cg.add(var.set_data_static(data_))
+            arr_id = ID(f"{var.base}_data", is_declaration=True, type=cg.uint8)
+            arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*data_))
+            cg.add(var.set_data_static(arr, len(data_)))
 
 
 # Mirage
diff --git a/esphome/components/remote_base/abbwelcome_protocol.h b/esphome/components/remote_base/abbwelcome_protocol.h
index b258bd920b..2ed90c502e 100644
--- a/esphome/components/remote_base/abbwelcome_protocol.h
+++ b/esphome/components/remote_base/abbwelcome_protocol.h
@@ -214,10 +214,14 @@ template<typename... Ts> class ABBWelcomeAction : public RemoteTransmitterAction
   TEMPLATABLE_VALUE(uint8_t, message_type)
   TEMPLATABLE_VALUE(uint8_t, message_id)
   TEMPLATABLE_VALUE(bool, auto_message_id)
-  void set_data_static(std::vector<uint8_t> data) { data_static_ = std::move(data); }
-  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
-    this->data_func_ = func;
-    has_data_func_ = true;
+  void set_data_template(std::vector<uint8_t> (*func)(Ts...)) {
+    this->data_.func = func;
+    this->static_ = false;
+  }
+  void set_data_static(const uint8_t *data, size_t len) {
+    this->data_.static_data.ptr = data;
+    this->data_.static_data.len = len;
+    this->static_ = true;
   }
   void encode(RemoteTransmitData *dst, Ts... x) override {
     ABBWelcomeData data;
@@ -228,19 +232,26 @@ template<typename... Ts> class ABBWelcomeAction : public RemoteTransmitterAction
     data.set_message_type(this->message_type_.value(x...));
     data.set_message_id(this->message_id_.value(x...));
     data.auto_message_id = this->auto_message_id_.value(x...);
-    if (has_data_func_) {
-      data.set_data(this->data_func_(x...));
+    std::vector<uint8_t> data_vec;
+    if (this->static_) {
+      data_vec.assign(this->data_.static_data.ptr, this->data_.static_data.ptr + this->data_.static_data.len);
     } else {
-      data.set_data(this->data_static_);
+      data_vec = this->data_.func(x...);
     }
+    data.set_data(data_vec);
     data.finalize();
     ABBWelcomeProtocol().encode(dst, data);
   }
 
  protected:
-  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
-  std::vector<uint8_t> data_static_{};
-  bool has_data_func_{false};
+  bool static_{true};
+  union Data {
+    std::vector<uint8_t> (*func)(Ts...);
+    struct {
+      const uint8_t *ptr;
+      size_t len;
+    } static_data;
+  } data_;
 };
 
 }  // namespace remote_base
diff --git a/tests/components/remote_transmitter/common-buttons.yaml b/tests/components/remote_transmitter/common-buttons.yaml
index e9593cc97c..101d60a893 100644
--- a/tests/components/remote_transmitter/common-buttons.yaml
+++ b/tests/components/remote_transmitter/common-buttons.yaml
@@ -1,3 +1,11 @@
+number:
+  - platform: template
+    id: test_number
+    optimistic: true
+    min_value: 0
+    max_value: 255
+    step: 1
+
 button:
   - platform: template
     name: Beo4 audio mute
@@ -217,6 +225,23 @@ button:
           command: 0xEC
           rc_code_1: 0x0D
           rc_code_2: 0x0D
+  - platform: template
+    name: ABBWelcome static
+    on_press:
+      remote_transmitter.transmit_abbwelcome:
+        source_address: 0x1234
+        destination_address: 0x5678
+        message_type: 0x01
+        data: [0x10, 0x20, 0x30]
+  - platform: template
+    name: ABBWelcome lambda
+    on_press:
+      remote_transmitter.transmit_abbwelcome:
+        source_address: 0x1234
+        destination_address: 0x5678
+        message_type: 0x01
+        data: !lambda |-
+          return {(uint8_t)id(test_number).state, 0x20, 0x30};
   - platform: template
     name: Digital Write
     on_press: