fix

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

esphome/components/api/api_frame_helper_noise.cpp

@@ -3,6 +3,7 @@
 #ifdef USE_API_NOISE
 #include "api_connection.h"  // For ClientInfo struct
 #include "esphome/core/application.h"
+#include "esphome/core/entity_base.h"
 #include "esphome/core/hal.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
@@ -256,28 +257,30 @@ APIError APINoiseFrameHelper::state_action_() {
   }
   if (state_ == State::SERVER_HELLO) {
     // send server hello
-    constexpr size_t mac_len = 13;  // 12 hex chars + null terminator
     const std::string &name = App.get_name();
-    char mac[mac_len];
+    char mac[MAC_ADDRESS_BUFFER_SIZE];
     get_mac_address_into_buffer(mac);
 
     // Calculate positions and sizes
     size_t name_len = name.size() + 1;  // including null terminator
     size_t name_offset = 1;
     size_t mac_offset = name_offset + name_len;
-    size_t total_size = 1 + name_len + mac_len;
+    size_t total_size = 1 + name_len + MAC_ADDRESS_BUFFER_SIZE;
 
-    auto msg = std::make_unique<uint8_t[]>(total_size);
+    // 1 (proto) + name (max ESPHOME_DEVICE_NAME_MAX_LEN) + 1 (name null)
+    // + mac (MAC_ADDRESS_BUFFER_SIZE - 1) + 1 (mac null)
+    constexpr size_t max_msg_size = 1 + ESPHOME_DEVICE_NAME_MAX_LEN + 1 + MAC_ADDRESS_BUFFER_SIZE;
+    uint8_t msg[max_msg_size];
 
     // chosen proto
     msg[0] = 0x01;
 
     // node name, terminated by null byte
-    std::memcpy(msg.get() + name_offset, name.c_str(), name_len);
+    std::memcpy(msg + name_offset, name.c_str(), name_len);
     // node mac, terminated by null byte
-    std::memcpy(msg.get() + mac_offset, mac, mac_len);
+    std::memcpy(msg + mac_offset, mac, MAC_ADDRESS_BUFFER_SIZE);
 
-    aerr = write_frame_(msg.get(), total_size);
+    aerr = write_frame_(msg, total_size);
     if (aerr != APIError::OK)
       return aerr;
 
@@ -353,35 +356,32 @@ APIError APINoiseFrameHelper::state_action_() {
   return APIError::OK;
 }
 void APINoiseFrameHelper::send_explicit_handshake_reject_(const LogString *reason) {
+  // Max reject message: "Bad handshake packet len" (24) + 1 (failure byte) = 25 bytes
+  uint8_t data[32];
+  data[0] = 0x01;  // failure
+
 #ifdef USE_STORE_LOG_STR_IN_FLASH
   // On ESP8266 with flash strings, we need to use PROGMEM-aware functions
   size_t reason_len = strlen_P(reinterpret_cast<PGM_P>(reason));
-  size_t data_size = reason_len + 1;
-  auto data = std::make_unique<uint8_t[]>(data_size);
-  data[0] = 0x01;  // failure
-
-  // Copy error message from PROGMEM
   if (reason_len > 0) {
-    memcpy_P(data.get() + 1, reinterpret_cast<PGM_P>(reason), reason_len);
+    memcpy_P(data + 1, reinterpret_cast<PGM_P>(reason), reason_len);
   }
 #else
   // Normal memory access
   const char *reason_str = LOG_STR_ARG(reason);
   size_t reason_len = strlen(reason_str);
-  size_t data_size = reason_len + 1;
-  auto data = std::make_unique<uint8_t[]>(data_size);
-  data[0] = 0x01;  // failure
-
-  // Copy error message in bulk
   if (reason_len > 0) {
-    std::memcpy(data.get() + 1, reason_str, reason_len);
+    // NOLINTNEXTLINE(bugprone-not-null-terminated-result) - binary protocol, not a C string
+    std::memcpy(data + 1, reason_str, reason_len);
   }
 #endif
 
+  size_t data_size = reason_len + 1;
+
   // temporarily remove failed state
   auto orig_state = state_;
   state_ = State::EXPLICIT_REJECT;
-  write_frame_(data.get(), data_size);
+  write_frame_(data, data_size);
   state_ = orig_state;
 }
 APIError APINoiseFrameHelper::read_packet(ReadPacketBuffer *buffer) {

esphome/components/api/homeassistant_service.h

@@ -25,9 +25,7 @@ template<typename... X> class TemplatableStringValue : public TemplatableValue<s
 
  private:
   // Helper to convert value to string - handles the case where value is already a string
-  template<typename T> static std::string value_to_string(T &&val) {
-    return to_string(std::forward<T>(val));  // NOLINT
-  }
+  template<typename T> static std::string value_to_string(T &&val) { return to_string(std::forward<T>(val)); }
 
   // Overloads for string types - needed because std::to_string doesn't support them
   static std::string value_to_string(char *val) {

esphome/components/esp32_ble/ble_uuid.h

@@ -48,7 +48,7 @@ class ESPBTUUID {
 
   // Remove before 2026.8.0
   ESPDEPRECATED("Use to_str() instead. Removed in 2026.8.0", "2026.2.0")
-  std::string to_string() const;  // NOLINT
+  std::string to_string() const;
   const char *to_str(std::span<char, UUID_STR_LEN> output) const;
 
  protected:

esphome/components/voice_assistant/voice_assistant.h

@@ -83,7 +83,7 @@ struct Timer {
   }
   // Remove before 2026.8.0
   ESPDEPRECATED("Use to_str() instead. Removed in 2026.8.0", "2026.2.0")
-  std::string to_string() const {  // NOLINT
+  std::string to_string() const {
     char buffer[TO_STR_BUFFER_SIZE];
     return this->to_str(buffer);
   }

esphome/components/wifi_info/text_sensor.py

@@ -79,13 +79,17 @@ async def setup_conf(config, key):
 
 async def to_code(config):
     # Request specific WiFi listeners based on which sensors are configured
+    # Each sensor needs its own listener slot - call request for EACH sensor
+
     # SSID and BSSID use WiFiConnectStateListener
-    if CONF_SSID in config or CONF_BSSID in config:
-        wifi.request_wifi_connect_state_listener()
+    for key in (CONF_SSID, CONF_BSSID):
+        if key in config:
+            wifi.request_wifi_connect_state_listener()
 
     # IP address and DNS use WiFiIPStateListener
-    if CONF_IP_ADDRESS in config or CONF_DNS_ADDRESS in config:
-        wifi.request_wifi_ip_state_listener()
+    for key in (CONF_IP_ADDRESS, CONF_DNS_ADDRESS):
+        if key in config:
+            wifi.request_wifi_ip_state_listener()
 
     # Scan results use WiFiScanResultsListener
     if CONF_SCAN_RESULTS in config:

esphome/components/x9c/x9c.cpp

@@ -6,7 +6,7 @@ namespace x9c {
 
 static const char *const TAG = "x9c.output";
 
-void X9cOutput::trim_value(int change_amount) {
+void X9cOutput::trim_value(int32_t change_amount) {
   if (change_amount == 0) {
     return;
   }
@@ -47,17 +47,17 @@ void X9cOutput::setup() {
 
   if (this->initial_value_ <= 0.50) {
     this->trim_value(-101);  // Set min value (beyond 0)
-    this->trim_value(static_cast<uint32_t>(roundf(this->initial_value_ * 100)));
+    this->trim_value(lroundf(this->initial_value_ * 100));
   } else {
     this->trim_value(101);  // Set max value (beyond 100)
-    this->trim_value(static_cast<uint32_t>(roundf(this->initial_value_ * 100) - 100));
+    this->trim_value(lroundf(this->initial_value_ * 100) - 100);
   }
   this->pot_value_ = this->initial_value_;
   this->write_state(this->initial_value_);
 }
 
 void X9cOutput::write_state(float state) {
-  this->trim_value(static_cast<uint32_t>(roundf((state - this->pot_value_) * 100)));
+  this->trim_value(lroundf((state - this->pot_value_) * 100));
   this->pot_value_ = state;
 }
 

esphome/components/x9c/x9c.h

@@ -18,7 +18,7 @@ class X9cOutput : public output::FloatOutput, public Component {
   void setup() override;
   void dump_config() override;
 
-  void trim_value(int change_amount);
+  void trim_value(int32_t change_amount);
 
  protected:
   void write_state(float state) override;

esphome/core/helpers.h

@@ -348,6 +348,8 @@ template<typename T> class FixedVector {
 
   size_t size() const { return size_; }
   bool empty() const { return size_ == 0; }
+  size_t capacity() const { return capacity_; }
+  bool full() const { return size_ == capacity_; }
 
   /// Access element without bounds checking (matches std::vector behavior)
   /// Caller must ensure index is valid (i < size())

script/ci-custom.py

@@ -732,47 +732,6 @@ def lint_no_heap_allocating_helpers(fname, match):
     )
 
 
-@lint_re_check(
-    # Match std::to_string() or unqualified to_string() calls
-    # The esphome namespace has "using std::to_string;" so unqualified calls resolve to std::to_string
-    # Use negative lookbehind to avoid matching:
-    #   - Function definitions: "const char *to_string(" or "std::string to_string("
-    #   - Method definitions: "Class::to_string("
-    #   - Method calls: ".to_string(" or "->to_string("
-    #   - Other identifiers: "_to_string("
-    r"(?<![*&.\w>:])to_string\s*\(" + CPP_RE_EOL,
-    include=cpp_include,
-    exclude=[
-        # Vendored library
-        "esphome/components/http_request/httplib.h",
-        # Deprecated helpers that return std::string
-        "esphome/core/helpers.cpp",
-        # The using declaration itself
-        "esphome/core/helpers.h",
-        # Test fixtures - not production embedded code
-        "tests/integration/fixtures/*",
-    ],
-)
-def lint_no_std_to_string(fname, match):
-    return (
-        f"{highlight('std::to_string()')} allocates heap memory. On long-running embedded "
-        f"devices, repeated heap allocations fragment memory over time.\n"
-        f"Please use {highlight('snprintf()')} with a stack buffer instead.\n"
-        f"\n"
-        f"Buffer sizes and format specifiers:\n"
-        f"  uint8_t/int8_t:   4 chars   - %u / %d (or PRIu8/PRId8)\n"
-        f"  uint16_t/int16_t: 6 chars   - %u / %d (or PRIu16/PRId16)\n"
-        f"  uint32_t/int32_t: 11 chars  - %" + "PRIu32 / %" + "PRId32\n"
-        "  uint64_t/int64_t: 21 chars  - %" + "PRIu64 / %" + "PRId64\n"
-        f"  float/double:     24 chars  - %.8g (15 digits + sign + decimal + e+XXX)\n"
-        f"                    317 chars - %f (for DBL_MAX: 309 int digits + decimal + 6 frac + sign)\n"
-        f"\n"
-        f"For sensor values, use value_accuracy_to_buf() from helpers.h.\n"
-        f'Example: char buf[11]; snprintf(buf, sizeof(buf), "%" PRIu32, value);\n'
-        f"(If strictly necessary, add `{highlight('// NOLINT')}` to the end of the line)"
-    )
-
-
 @lint_content_find_check(
     "ESP_LOG",
     include=["*.h", "*.tcc"],