diff --git a/esphome/components/animation/__init__.py b/esphome/components/animation/__init__.py
index 3f03e5c185..1780bdf72e 100644
--- a/esphome/components/animation/__init__.py
+++ b/esphome/components/animation/__init__.py
@@ -60,6 +60,10 @@ async def to_code(config):
             image.seek(frameIndex)
             frame = image.convert("L", dither=Image.NONE)
             pixels = list(frame.getdata())
+            if len(pixels) != height * width:
+                raise core.EsphomeError(
+                    f"Unexpected number of pixels in frame {frameIndex}: {len(pixels)} != {height*width}"
+                )
             for pix in pixels:
                 data[pos] = pix
                 pos += 1
@@ -69,8 +73,14 @@ async def to_code(config):
         pos = 0
         for frameIndex in range(frames):
             image.seek(frameIndex)
+            if CONF_RESIZE in config:
+                image.thumbnail(config[CONF_RESIZE])
             frame = image.convert("RGB")
             pixels = list(frame.getdata())
+            if len(pixels) != height * width:
+                raise core.EsphomeError(
+                    f"Unexpected number of pixels in frame {frameIndex}: {len(pixels)} != {height*width}"
+                )
             for pix in pixels:
                 data[pos] = pix[0]
                 pos += 1
diff --git a/esphome/components/anova/anova_base.cpp b/esphome/components/anova/anova_base.cpp
index d55404089e..dcef75e483 100644
--- a/esphome/components/anova/anova_base.cpp
+++ b/esphome/components/anova/anova_base.cpp
@@ -73,51 +73,52 @@ AnovaPacket *AnovaCodec::get_stop_request() {
 }
 
 void AnovaCodec::decode(const uint8_t *data, uint16_t length) {
-  memset(this->buf_, 0, 32);
-  strncpy(this->buf_, (char *) data, length);
+  char buf[32];
+  memset(buf, 0, sizeof(buf));
+  strncpy(buf, (char *) data, std::min<uint16_t>(length, sizeof(buf) - 1));
   this->has_target_temp_ = this->has_current_temp_ = this->has_unit_ = this->has_running_ = false;
   switch (this->current_query_) {
     case READ_DEVICE_STATUS: {
-      if (!strncmp(this->buf_, "stopped", 7)) {
+      if (!strncmp(buf, "stopped", 7)) {
         this->has_running_ = true;
         this->running_ = false;
       }
-      if (!strncmp(this->buf_, "running", 7)) {
+      if (!strncmp(buf, "running", 7)) {
         this->has_running_ = true;
         this->running_ = true;
       }
       break;
     }
     case START: {
-      if (!strncmp(this->buf_, "start", 5)) {
+      if (!strncmp(buf, "start", 5)) {
         this->has_running_ = true;
         this->running_ = true;
       }
       break;
     }
     case STOP: {
-      if (!strncmp(this->buf_, "stop", 4)) {
+      if (!strncmp(buf, "stop", 4)) {
         this->has_running_ = true;
         this->running_ = false;
       }
       break;
     }
     case READ_TARGET_TEMPERATURE: {
-      this->target_temp_ = parse_number<float>(this->buf_, sizeof(this->buf_)).value_or(0.0f);
+      this->target_temp_ = parse_number<float>(buf, sizeof(buf)).value_or(0.0f);
       if (this->fahrenheit_)
         this->target_temp_ = ftoc(this->target_temp_);
       this->has_target_temp_ = true;
       break;
     }
     case SET_TARGET_TEMPERATURE: {
-      this->target_temp_ = parse_number<float>(this->buf_, sizeof(this->buf_)).value_or(0.0f);
+      this->target_temp_ = parse_number<float>(buf, sizeof(buf)).value_or(0.0f);
       if (this->fahrenheit_)
         this->target_temp_ = ftoc(this->target_temp_);
       this->has_target_temp_ = true;
       break;
     }
     case READ_CURRENT_TEMPERATURE: {
-      this->current_temp_ = parse_number<float>(this->buf_, sizeof(this->buf_)).value_or(0.0f);
+      this->current_temp_ = parse_number<float>(buf, sizeof(buf)).value_or(0.0f);
       if (this->fahrenheit_)
         this->current_temp_ = ftoc(this->current_temp_);
       this->has_current_temp_ = true;
@@ -125,8 +126,8 @@ void AnovaCodec::decode(const uint8_t *data, uint16_t length) {
     }
     case SET_UNIT:
     case READ_UNIT: {
-      this->unit_ = this->buf_[0];
-      this->fahrenheit_ = this->buf_[0] == 'f';
+      this->unit_ = buf[0];
+      this->fahrenheit_ = buf[0] == 'f';
       this->has_unit_ = true;
       break;
     }
diff --git a/esphome/components/anova/anova_base.h b/esphome/components/anova/anova_base.h
index 7c1383512d..b831157849 100644
--- a/esphome/components/anova/anova_base.h
+++ b/esphome/components/anova/anova_base.h
@@ -70,7 +70,6 @@ class AnovaCodec {
   bool has_current_temp_;
   bool has_unit_;
   bool has_running_;
-  char buf_[32];
   bool fahrenheit_;
 
   CurrentQuery current_query_;
diff --git a/esphome/components/esp32_camera_web_server/camera_web_server.cpp b/esphome/components/esp32_camera_web_server/camera_web_server.cpp
index c9a684c7e5..653a274bf4 100644
--- a/esphome/components/esp32_camera_web_server/camera_web_server.cpp
+++ b/esphome/components/esp32_camera_web_server/camera_web_server.cpp
@@ -21,12 +21,19 @@ static const char *const TAG = "esp32_camera_web_server";
 #define CONTENT_TYPE "image/jpeg"
 #define CONTENT_LENGTH "Content-Length"
 
-static const char *const STREAM_HEADER =
-    "HTTP/1.1 200\r\nAccess-Control-Allow-Origin: *\r\nContent-Type: multipart/x-mixed-replace;boundary=" PART_BOUNDARY
-    "\r\n";
-static const char *const STREAM_500 = "HTTP/1.1 500\r\nContent-Type: text/plain\r\n\r\nNo frames send.\r\n";
-static const char *const STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
+static const char *const STREAM_HEADER = "HTTP/1.0 200 OK\r\n"
+                                         "Access-Control-Allow-Origin: *\r\n"
+                                         "Connection: close\r\n"
+                                         "Content-Type: multipart/x-mixed-replace;boundary=" PART_BOUNDARY "\r\n"
+                                         "\r\n"
+                                         "--" PART_BOUNDARY "\r\n";
+static const char *const STREAM_ERROR = "Content-Type: text/plain\r\n"
+                                        "\r\n"
+                                        "No frames send.\r\n"
+                                        "--" PART_BOUNDARY "\r\n";
 static const char *const STREAM_PART = "Content-Type: " CONTENT_TYPE "\r\n" CONTENT_LENGTH ": %u\r\n\r\n";
+static const char *const STREAM_BOUNDARY = "\r\n"
+                                           "--" PART_BOUNDARY "\r\n";
 
 CameraWebServer::CameraWebServer() {}
 
@@ -45,6 +52,7 @@ void CameraWebServer::setup() {
   config.ctrl_port = this->port_;
   config.max_open_sockets = 1;
   config.backlog_conn = 2;
+  config.lru_purge_enable = true;
 
   if (httpd_start(&this->httpd_, &config) != ESP_OK) {
     mark_failed();
@@ -172,9 +180,6 @@ esp_err_t CameraWebServer::streaming_handler_(struct httpd_req *req) {
       ESP_LOGW(TAG, "STREAM: failed to acquire frame");
       res = ESP_FAIL;
     }
-    if (res == ESP_OK) {
-      res = httpd_send_all(req, STREAM_BOUNDARY, strlen(STREAM_BOUNDARY));
-    }
     if (res == ESP_OK) {
       size_t hlen = snprintf(part_buf, 64, STREAM_PART, image->get_data_length());
       res = httpd_send_all(req, part_buf, hlen);
@@ -182,6 +187,9 @@ esp_err_t CameraWebServer::streaming_handler_(struct httpd_req *req) {
     if (res == ESP_OK) {
       res = httpd_send_all(req, (const char *) image->get_data_buffer(), image->get_data_length());
     }
+    if (res == ESP_OK) {
+      res = httpd_send_all(req, STREAM_BOUNDARY, strlen(STREAM_BOUNDARY));
+    }
     if (res == ESP_OK) {
       frames++;
       int64_t frame_time = millis() - last_frame;
@@ -193,7 +201,7 @@ esp_err_t CameraWebServer::streaming_handler_(struct httpd_req *req) {
   }
 
   if (!frames) {
-    res = httpd_send_all(req, STREAM_500, strlen(STREAM_500));
+    res = httpd_send_all(req, STREAM_ERROR, strlen(STREAM_ERROR));
   }
 
   ESP_LOGI(TAG, "STREAM: closed. Frames: %u", frames);
diff --git a/esphome/components/ezo/ezo.cpp b/esphome/components/ezo/ezo.cpp
index 7f7a41fb41..426f2807c1 100644
--- a/esphome/components/ezo/ezo.cpp
+++ b/esphome/components/ezo/ezo.cpp
@@ -32,7 +32,7 @@ void EZOSensor::update() {
 }
 
 void EZOSensor::loop() {
-  uint8_t buf[20];
+  uint8_t buf[21];
   if (!(this->state_ & EZO_STATE_WAIT)) {
     if (this->state_ & EZO_STATE_SEND_TEMP) {
       int len = sprintf((char *) buf, "T,%0.3f", this->tempcomp_);
@@ -74,7 +74,7 @@ void EZOSensor::loop() {
   if (buf[0] != 1)
     return;
 
-  float val = parse_number<float>((char *) &buf[1], sizeof(buf) - 1).value_or(0);
+  float val = parse_number<float>((char *) &buf[1], sizeof(buf) - 2).value_or(0);
   this->publish_state(val);
 }
 
diff --git a/esphome/components/uart/__init__.py b/esphome/components/uart/__init__.py
index 53209dfc7b..159b08d2d9 100644
--- a/esphome/components/uart/__init__.py
+++ b/esphome/components/uart/__init__.py
@@ -94,17 +94,21 @@ UART_DIRECTIONS = {
     "BOTH": UARTDirection.UART_DIRECTION_BOTH,
 }
 
+AFTER_DEFAULTS = {CONF_BYTES: 256, CONF_TIMEOUT: "100ms"}
+
 DEBUG_SCHEMA = cv.Schema(
     {
         cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(UARTDebugger),
         cv.Optional(CONF_DIRECTION, default="BOTH"): cv.enum(
             UART_DIRECTIONS, upper=True
         ),
-        cv.Optional(CONF_AFTER): cv.Schema(
+        cv.Optional(CONF_AFTER, default=AFTER_DEFAULTS): cv.Schema(
             {
-                cv.Optional(CONF_BYTES, default=256): cv.validate_bytes,
                 cv.Optional(
-                    CONF_TIMEOUT, default="100ms"
+                    CONF_BYTES, default=AFTER_DEFAULTS[CONF_BYTES]
+                ): cv.validate_bytes,
+                cv.Optional(
+                    CONF_TIMEOUT, default=AFTER_DEFAULTS[CONF_TIMEOUT]
                 ): cv.positive_time_period_milliseconds,
                 cv.Optional(CONF_DELIMITER): cv.templatable(validate_raw_data),
             }
diff --git a/esphome/components/zyaura/zyaura.cpp b/esphome/components/zyaura/zyaura.cpp
index 11643a5c23..621439aa0c 100644
--- a/esphome/components/zyaura/zyaura.cpp
+++ b/esphome/components/zyaura/zyaura.cpp
@@ -57,38 +57,46 @@ void IRAM_ATTR ZaSensorStore::interrupt(ZaSensorStore *arg) {
 void IRAM_ATTR ZaSensorStore::set_data_(ZaMessage *message) {
   switch (message->type) {
     case HUMIDITY:
-      this->humidity = (message->value > 10000) ? NAN : (message->value / 100.0f);
+      this->humidity = message->value;
       break;
-
     case TEMPERATURE:
-      this->temperature = (message->value > 5970) ? NAN : (message->value / 16.0f - 273.15f);
+      this->temperature = message->value;
       break;
-
     case CO2:
-      this->co2 = (message->value > 10000) ? NAN : message->value;
-      break;
-
-    default:
+      this->co2 = message->value;
       break;
   }
 }
 
-bool ZyAuraSensor::publish_state_(sensor::Sensor *sensor, float *value) {
-  // Sensor doesn't added to configuration
+bool ZyAuraSensor::publish_state_(ZaDataType data_type, sensor::Sensor *sensor, uint16_t *data_value) {
+  // Sensor wasn't added to configuration
   if (sensor == nullptr) {
     return true;
   }
 
-  sensor->publish_state(*value);
+  float value = NAN;
+  switch (data_type) {
+    case HUMIDITY:
+      value = (*data_value > 10000) ? NAN : (*data_value / 100.0f);
+      break;
+    case TEMPERATURE:
+      value = (*data_value > 5970) ? NAN : (*data_value / 16.0f - 273.15f);
+      break;
+    case CO2:
+      value = (*data_value > 10000) ? NAN : *data_value;
+      break;
+  }
+
+  sensor->publish_state(value);
 
   // Sensor reported wrong value
-  if (std::isnan(*value)) {
+  if (std::isnan(value)) {
     ESP_LOGW(TAG, "Sensor reported invalid data. Is the update interval too small?");
     this->status_set_warning();
     return false;
   }
 
-  *value = NAN;
+  *data_value = -1;
   return true;
 }
 
@@ -104,9 +112,9 @@ void ZyAuraSensor::dump_config() {
 }
 
 void ZyAuraSensor::update() {
-  bool co2_result = this->publish_state_(this->co2_sensor_, &this->store_.co2);
-  bool temperature_result = this->publish_state_(this->temperature_sensor_, &this->store_.temperature);
-  bool humidity_result = this->publish_state_(this->humidity_sensor_, &this->store_.humidity);
+  bool co2_result = this->publish_state_(CO2, this->co2_sensor_, &this->store_.co2);
+  bool temperature_result = this->publish_state_(TEMPERATURE, this->temperature_sensor_, &this->store_.temperature);
+  bool humidity_result = this->publish_state_(HUMIDITY, this->humidity_sensor_, &this->store_.humidity);
 
   if (co2_result && temperature_result && humidity_result) {
     this->status_clear_warning();
diff --git a/esphome/components/zyaura/zyaura.h b/esphome/components/zyaura/zyaura.h
index 2b9e3fbb35..85c31ec75a 100644
--- a/esphome/components/zyaura/zyaura.h
+++ b/esphome/components/zyaura/zyaura.h
@@ -42,9 +42,9 @@ class ZaDataProcessor {
 
 class ZaSensorStore {
  public:
-  float co2 = NAN;
-  float temperature = NAN;
-  float humidity = NAN;
+  uint16_t co2 = -1;
+  uint16_t temperature = -1;
+  uint16_t humidity = -1;
 
   void setup(InternalGPIOPin *pin_clock, InternalGPIOPin *pin_data);
   static void interrupt(ZaSensorStore *arg);
@@ -79,7 +79,7 @@ class ZyAuraSensor : public PollingComponent {
   sensor::Sensor *temperature_sensor_{nullptr};
   sensor::Sensor *humidity_sensor_{nullptr};
 
-  bool publish_state_(sensor::Sensor *sensor, float *value);
+  bool publish_state_(ZaDataType data_type, sensor::Sensor *sensor, uint16_t *data_value);
 };
 
 }  // namespace zyaura
diff --git a/esphome/const.py b/esphome/const.py
index 4bd02022d1..6af44197ff 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2021.11.1"
+__version__ = "2021.11.2"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"
 
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index c67ad8eea3..9cdbf7ca16 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -362,45 +362,47 @@ std::string str_sanitize(const std::string &str);
 /// @name Parsing & formatting
 ///@{
 
-/// Parse a unsigned decimal number.
+/// Parse an unsigned decimal number (requires null-terminated string).
 template<typename T, enable_if_t<(std::is_integral<T>::value && std::is_unsigned<T>::value), int> = 0>
 optional<T> parse_number(const char *str, size_t len) {
   char *end = nullptr;
   unsigned long value = ::strtoul(str, &end, 10);  // NOLINT(google-runtime-int)
-  if (end == nullptr || end != str + len || value > std::numeric_limits<T>::max())
+  if (end == str || *end != '\0' || value > std::numeric_limits<T>::max())
     return {};
   return value;
 }
+/// Parse an unsigned decimal number.
 template<typename T, enable_if_t<(std::is_integral<T>::value && std::is_unsigned<T>::value), int> = 0>
 optional<T> parse_number(const std::string &str) {
-  return parse_number<T>(str.c_str(), str.length());
+  return parse_number<T>(str.c_str(), str.length() + 1);
 }
-/// Parse a signed decimal number.
+/// Parse a signed decimal number (requires null-terminated string).
 template<typename T, enable_if_t<(std::is_integral<T>::value && std::is_signed<T>::value), int> = 0>
 optional<T> parse_number(const char *str, size_t len) {
   char *end = nullptr;
   signed long value = ::strtol(str, &end, 10);  // NOLINT(google-runtime-int)
-  if (end == nullptr || end != str + len || value < std::numeric_limits<T>::min() ||
-      value > std::numeric_limits<T>::max())
+  if (end == str || *end != '\0' || value < std::numeric_limits<T>::min() || value > std::numeric_limits<T>::max())
     return {};
   return value;
 }
+/// Parse a signed decimal number.
 template<typename T, enable_if_t<(std::is_integral<T>::value && std::is_signed<T>::value), int> = 0>
 optional<T> parse_number(const std::string &str) {
-  return parse_number<T>(str.c_str(), str.length());
+  return parse_number<T>(str.c_str(), str.length() + 1);
 }
-/// Parse a decimal floating-point number.
+/// Parse a decimal floating-point number (requires null-terminated string).
 template<typename T, enable_if_t<(std::is_same<T, float>::value), int> = 0>
 optional<T> parse_number(const char *str, size_t len) {
   char *end = nullptr;
   float value = ::strtof(str, &end);
-  if (end == nullptr || end != str + len || value == HUGE_VALF)
+  if (end == str || *end != '\0' || value == HUGE_VALF)
     return {};
   return value;
 }
+/// Parse a decimal floating-point number.
 template<typename T, enable_if_t<(std::is_same<T, float>::value), int> = 0>
 optional<T> parse_number(const std::string &str) {
-  return parse_number<T>(str.c_str(), str.length());
+  return parse_number<T>(str.c_str(), str.length() + 1);
 }
 
 ///@}
diff --git a/tests/test2.yaml b/tests/test2.yaml
index f90e522b1e..3afef9501d 100644
--- a/tests/test2.yaml
+++ b/tests/test2.yaml
@@ -39,6 +39,12 @@ uart:
   tx_pin: GPIO22
   rx_pin: GPIO23
   baud_rate: 115200
+  # Specifically added for testing debug with no after: definition.
+  debug:
+    dummy_receiver: false
+    direction: rx
+    sequence:
+      - lambda: UARTDebug::log_hex(direction, bytes, ':');
 
 ota:
   safe_mode: True