[udp] Implement UDP sensor broadcast (#6865)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Co-authored-by: clydebarrow <366188+clydebarrow@users.noreply.github.com>

CODEOWNERS

@@ -423,6 +423,7 @@ esphome/components/tuya/switch/* @jesserockz
 esphome/components/tuya/text_sensor/* @dentra
 esphome/components/uart/* @esphome/core
 esphome/components/uart/button/* @ssieb
+esphome/components/udp/* @clydebarrow
 esphome/components/ufire_ec/* @pvizeli
 esphome/components/ufire_ise/* @pvizeli
 esphome/components/ultrasonic/* @OttoWinter

esphome/components/udp/__init__.py

@@ -0,0 +1,158 @@
+import hashlib
+
+import esphome.codegen as cg
+from esphome.components.api import CONF_ENCRYPTION
+from esphome.components.binary_sensor import BinarySensor
+from esphome.components.sensor import Sensor
+import esphome.config_validation as cv
+from esphome.const import (
+    CONF_BINARY_SENSORS,
+    CONF_ID,
+    CONF_INTERNAL,
+    CONF_KEY,
+    CONF_NAME,
+    CONF_PORT,
+    CONF_SENSORS,
+)
+from esphome.cpp_generator import MockObjClass
+
+CODEOWNERS = ["@clydebarrow"]
+DEPENDENCIES = ["network"]
+AUTO_LOAD = ["socket"]
+MULTI_CONF = True
+
+udp_ns = cg.esphome_ns.namespace("udp")
+UDPComponent = udp_ns.class_("UDPComponent", cg.PollingComponent)
+
+CONF_BROADCAST = "broadcast"
+CONF_BROADCAST_ID = "broadcast_id"
+CONF_ADDRESSES = "addresses"
+CONF_PROVIDER = "provider"
+CONF_PROVIDERS = "providers"
+CONF_REMOTE_ID = "remote_id"
+CONF_UDP_ID = "udp_id"
+CONF_PING_PONG_ENABLE = "ping_pong_enable"
+CONF_PING_PONG_RECYCLE_TIME = "ping_pong_recycle_time"
+CONF_ROLLING_CODE_ENABLE = "rolling_code_enable"
+
+
+def sensor_validation(cls: MockObjClass):
+    return cv.maybe_simple_value(
+        cv.Schema(
+            {
+                cv.Required(CONF_ID): cv.use_id(cls),
+                cv.Optional(CONF_BROADCAST_ID): cv.validate_id_name,
+            }
+        ),
+        key=CONF_ID,
+    )
+
+
+ENCRYPTION_SCHEMA = {
+    cv.Optional(CONF_ENCRYPTION): cv.maybe_simple_value(
+        cv.Schema(
+            {
+                cv.Required(CONF_KEY): cv.string,
+            }
+        ),
+        key=CONF_KEY,
+    )
+}
+
+PROVIDER_SCHEMA = cv.Schema(
+    {
+        cv.Required(CONF_NAME): cv.valid_name,
+    }
+).extend(ENCRYPTION_SCHEMA)
+
+
+def validate_(config):
+    if CONF_ENCRYPTION in config:
+        if CONF_SENSORS not in config and CONF_BINARY_SENSORS not in config:
+            raise cv.Invalid("No sensors or binary sensors to encrypt")
+    elif config[CONF_ROLLING_CODE_ENABLE]:
+        raise cv.Invalid("Rolling code requires an encryption key")
+    if config[CONF_PING_PONG_ENABLE]:
+        if not any(CONF_ENCRYPTION in p for p in config.get(CONF_PROVIDERS) or ()):
+            raise cv.Invalid("Ping-pong requires at least one encrypted provider")
+    return config
+
+
+CONFIG_SCHEMA = cv.All(
+    cv.polling_component_schema("15s")
+    .extend(
+        {
+            cv.GenerateID(): cv.declare_id(UDPComponent),
+            cv.Optional(CONF_PORT, default=18511): cv.port,
+            cv.Optional(CONF_ADDRESSES, default=["255.255.255.255"]): cv.ensure_list(
+                cv.ipv4
+            ),
+            cv.Optional(CONF_ROLLING_CODE_ENABLE, default=False): cv.boolean,
+            cv.Optional(CONF_PING_PONG_ENABLE, default=False): cv.boolean,
+            cv.Optional(
+                CONF_PING_PONG_RECYCLE_TIME, default="600s"
+            ): cv.positive_time_period_seconds,
+            cv.Optional(CONF_SENSORS): cv.ensure_list(sensor_validation(Sensor)),
+            cv.Optional(CONF_BINARY_SENSORS): cv.ensure_list(
+                sensor_validation(BinarySensor)
+            ),
+            cv.Optional(CONF_PROVIDERS): cv.ensure_list(PROVIDER_SCHEMA),
+        },
+    )
+    .extend(ENCRYPTION_SCHEMA),
+    validate_,
+)
+
+SENSOR_SCHEMA = cv.Schema(
+    {
+        cv.Optional(CONF_REMOTE_ID): cv.string_strict,
+        cv.Required(CONF_PROVIDER): cv.valid_name,
+        cv.GenerateID(CONF_UDP_ID): cv.use_id(UDPComponent),
+    }
+)
+
+
+def require_internal_with_name(config):
+    if CONF_NAME in config and CONF_INTERNAL not in config:
+        raise cv.Invalid("Must provide internal: config when using name:")
+    return config
+
+
+def hash_encryption_key(config: dict):
+    return list(hashlib.sha256(config[CONF_KEY].encode()).digest())
+
+
+async def to_code(config):
+    cg.add_define("USE_UDP")
+    cg.add_global(udp_ns.using)
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    cg.add(var.set_port(config[CONF_PORT]))
+    cg.add(var.set_rolling_code_enable(config[CONF_ROLLING_CODE_ENABLE]))
+    cg.add(var.set_ping_pong_enable(config[CONF_PING_PONG_ENABLE]))
+    cg.add(
+        var.set_ping_pong_recycle_time(
+            config[CONF_PING_PONG_RECYCLE_TIME].total_seconds
+        )
+    )
+    for sens_conf in config.get(CONF_SENSORS, ()):
+        sens_id = sens_conf[CONF_ID]
+        sensor = await cg.get_variable(sens_id)
+        bcst_id = sens_conf.get(CONF_BROADCAST_ID, sens_id.id)
+        cg.add(var.add_sensor(bcst_id, sensor))
+    for sens_conf in config.get(CONF_BINARY_SENSORS, ()):
+        sens_id = sens_conf[CONF_ID]
+        sensor = await cg.get_variable(sens_id)
+        bcst_id = sens_conf.get(CONF_BROADCAST_ID, sens_id.id)
+        cg.add(var.add_binary_sensor(bcst_id, sensor))
+    for address in config[CONF_ADDRESSES]:
+        cg.add(var.add_address(str(address)))
+
+    if encryption := config.get(CONF_ENCRYPTION):
+        cg.add(var.set_encryption_key(hash_encryption_key(encryption)))
+
+    for provider in config.get(CONF_PROVIDERS, ()):
+        name = provider[CONF_NAME]
+        cg.add(var.add_provider(name))
+        if encryption := provider.get(CONF_ENCRYPTION):
+            cg.add(var.set_provider_encryption(name, hash_encryption_key(encryption)))

esphome/components/udp/binary_sensor.py

@@ -0,0 +1,27 @@
+import esphome.codegen as cg
+from esphome.components import binary_sensor
+from esphome.config_validation import All, has_at_least_one_key
+from esphome.const import CONF_ID
+
+from . import (
+    CONF_PROVIDER,
+    CONF_REMOTE_ID,
+    CONF_UDP_ID,
+    SENSOR_SCHEMA,
+    require_internal_with_name,
+)
+
+DEPENDENCIES = ["udp"]
+
+CONFIG_SCHEMA = All(
+    binary_sensor.binary_sensor_schema().extend(SENSOR_SCHEMA),
+    has_at_least_one_key(CONF_ID, CONF_REMOTE_ID),
+    require_internal_with_name,
+)
+
+
+async def to_code(config):
+    var = await binary_sensor.new_binary_sensor(config)
+    comp = await cg.get_variable(config[CONF_UDP_ID])
+    remote_id = str(config.get(CONF_REMOTE_ID) or config.get(CONF_ID))
+    cg.add(comp.add_remote_binary_sensor(config[CONF_PROVIDER], remote_id, var))

esphome/components/udp/sensor.py

@@ -0,0 +1,27 @@
+import esphome.codegen as cg
+from esphome.components.sensor import new_sensor, sensor_schema
+from esphome.config_validation import All, has_at_least_one_key
+from esphome.const import CONF_ID
+
+from . import (
+    CONF_PROVIDER,
+    CONF_REMOTE_ID,
+    CONF_UDP_ID,
+    SENSOR_SCHEMA,
+    require_internal_with_name,
+)
+
+DEPENDENCIES = ["udp"]
+
+CONFIG_SCHEMA = All(
+    sensor_schema().extend(SENSOR_SCHEMA),
+    has_at_least_one_key(CONF_ID, CONF_REMOTE_ID),
+    require_internal_with_name,
+)
+
+
+async def to_code(config):
+    var = await new_sensor(config)
+    comp = await cg.get_variable(config[CONF_UDP_ID])
+    remote_id = str(config.get(CONF_REMOTE_ID) or config.get(CONF_ID))
+    cg.add(comp.add_remote_sensor(config[CONF_PROVIDER], remote_id, var))

esphome/components/udp/udp_component.cpp

@@ -0,0 +1,616 @@
+#include "esphome/core/log.h"
+#include "esphome/core/application.h"
+#include "esphome/components/network/util.h"
+#include "udp_component.h"
+
+namespace esphome {
+namespace udp {
+
+/**
+ * Structure of a data packet; everything is little-endian
+ *
+ * --- In clear text ---
+ * MAGIC_NUMBER: 16 bits
+ * host name length: 1 byte
+ * host name: (length) bytes
+ * padding: 0 or more null bytes to a 4 byte boundary
+ *
+ * --- Encrypted (if key set) ----
+ * DATA_KEY: 1 byte: OR ROLLING_CODE_KEY:
+ *  Rolling code (if enabled): 8 bytes
+ * Ping keys: if any
+ * repeat:
+ *      PING_KEY: 1 byte
+ *      ping code: 4 bytes
+ * Sensors:
+ * repeat:
+ *      SENSOR_KEY: 1 byte
+ *      float value: 4 bytes
+ *      name length: 1 byte
+ *      name
+ * Binary Sensors:
+ * repeat:
+ *      BINARY_SENSOR_KEY: 1 byte
+ *      bool value: 1 bytes
+ *      name length: 1 byte
+ *      name
+ *
+ * Padded to a 4 byte boundary with nulls
+ *
+ * Structure of a ping request packet:
+ * --- In clear text ---
+ * MAGIC_PING: 16 bits
+ * host name length: 1 byte
+ * host name: (length) bytes
+ * Ping key (4 bytes)
+ *
+ */
+static const char *const TAG = "udp";
+
+/**
+ * XXTEA implementation, using 256 bit key.
+ */
+
+static const uint32_t DELTA = 0x9e3779b9;
+#define MX ((((z >> 5) ^ (y << 2)) + ((y >> 3) ^ (z << 4))) ^ ((sum ^ y) + (k[(p ^ e) & 7] ^ z)))
+
+/**
+ * Encrypt a block of data in-place
+ */
+
+static void xxtea_encrypt(uint32_t *v, size_t n, const uint32_t *k) {
+  uint32_t z, y, sum, e;
+  size_t p;
+  size_t q = 6 + 52 / n;
+  sum = 0;
+  z = v[n - 1];
+  while (q-- != 0) {
+    sum += DELTA;
+    e = (sum >> 2);
+    for (p = 0; p != n - 1; p++) {
+      y = v[p + 1];
+      z = v[p] += MX;
+    }
+    y = v[0];
+    z = v[n - 1] += MX;
+  }
+}
+
+static void xxtea_decrypt(uint32_t *v, size_t n, const uint32_t *k) {
+  uint32_t z, y, sum, e;
+  size_t p;
+  size_t q = 6 + 52 / n;
+  sum = q * DELTA;
+  y = v[0];
+  while (q-- != 0) {
+    e = (sum >> 2);
+    for (p = n - 1; p != 0; p--) {
+      z = v[p - 1];
+      y = v[p] -= MX;
+    }
+    z = v[n - 1];
+    y = v[0] -= MX;
+    sum -= DELTA;
+  }
+}
+
+inline static size_t round4(size_t value) { return (value + 3) & ~3; }
+
+union FuData {
+  uint32_t u32;
+  float f32;
+};
+
+static const size_t MAX_PACKET_SIZE = 508;
+static const uint16_t MAGIC_NUMBER = 0x4553;
+static const uint16_t MAGIC_PING = 0x5048;
+static const uint32_t PREF_HASH = 0x45535043;
+enum DataKey {
+  ZERO_FILL_KEY,
+  DATA_KEY,
+  SENSOR_KEY,
+  BINARY_SENSOR_KEY,
+  PING_KEY,
+  ROLLING_CODE_KEY,
+};
+
+static const size_t MAX_PING_KEYS = 4;
+
+static inline void add(std::vector<uint8_t> &vec, uint32_t data) {
+  vec.push_back(data & 0xFF);
+  vec.push_back((data >> 8) & 0xFF);
+  vec.push_back((data >> 16) & 0xFF);
+  vec.push_back((data >> 24) & 0xFF);
+}
+
+static inline uint32_t get_uint32(uint8_t *&buf) {
+  uint32_t data = *buf++;
+  data += *buf++ << 8;
+  data += *buf++ << 16;
+  data += *buf++ << 24;
+  return data;
+}
+
+static inline uint16_t get_uint16(uint8_t *&buf) {
+  uint16_t data = *buf++;
+  data += *buf++ << 8;
+  return data;
+}
+
+static inline void add(std::vector<uint8_t> &vec, uint8_t data) { vec.push_back(data); }
+static inline void add(std::vector<uint8_t> &vec, uint16_t data) {
+  vec.push_back((uint8_t) data);
+  vec.push_back((uint8_t) (data >> 8));
+}
+static inline void add(std::vector<uint8_t> &vec, DataKey data) { vec.push_back(data); }
+static void add(std::vector<uint8_t> &vec, const char *str) {
+  auto len = strlen(str);
+  vec.push_back(len);
+  for (size_t i = 0; i != len; i++) {
+    vec.push_back(*str++);
+  }
+}
+
+void UDPComponent::setup() {
+  this->name_ = App.get_name().c_str();
+  if (strlen(this->name_) > 255) {
+    this->mark_failed();
+    this->status_set_error("Device name exceeds 255 chars");
+    return;
+  }
+  this->resend_ping_key_ = this->ping_pong_enable_;
+  // restore the upper 32 bits of the rolling code, increment and save.
+  this->pref_ = global_preferences->make_preference<uint32_t>(PREF_HASH, true);
+  this->pref_.load(&this->rolling_code_[1]);
+  this->rolling_code_[1]++;
+  this->pref_.save(&this->rolling_code_[1]);
+  this->ping_key_ = random_uint32();
+  ESP_LOGV(TAG, "Rolling code incremented, upper part now %u", (unsigned) this->rolling_code_[1]);
+#ifdef USE_SENSOR
+  for (auto &sensor : this->sensors_) {
+    sensor.sensor->add_on_state_callback([this, &sensor](float x) {
+      this->updated_ = true;
+      sensor.updated = true;
+    });
+  }
+#endif
+#ifdef USE_BINARY_SENSOR
+  for (auto &sensor : this->binary_sensors_) {
+    sensor.sensor->add_on_state_callback([this, &sensor](bool value) {
+      this->updated_ = true;
+      sensor.updated = true;
+    });
+  }
+#endif
+  this->should_send_ = this->ping_pong_enable_;
+#ifdef USE_SENSOR
+  this->should_send_ |= !this->sensors_.empty();
+#endif
+#ifdef USE_BINARY_SENSOR
+  this->should_send_ |= !this->binary_sensors_.empty();
+#endif
+  this->should_listen_ = !this->providers_.empty() || this->is_encrypted_();
+  // initialise the header. This is invariant.
+  add(this->header_, MAGIC_NUMBER);
+  add(this->header_, this->name_);
+  // pad to a multiple of 4 bytes
+  while (this->header_.size() & 0x3)
+    this->header_.push_back(0);
+#if defined(USE_SOCKET_IMPL_BSD_SOCKETS) || defined(USE_SOCKET_IMPL_LWIP_SOCKETS)
+  for (const auto &address : this->addresses_) {
+    struct sockaddr saddr {};
+    socket::set_sockaddr(&saddr, sizeof(saddr), address, this->port_);
+    this->sockaddrs_.push_back(saddr);
+  }
+  // set up broadcast socket
+  if (this->should_send_) {
+    this->broadcast_socket_ = socket::socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+    if (this->broadcast_socket_ == nullptr) {
+      this->mark_failed();
+      this->status_set_error("Could not create socket");
+      return;
+    }
+    int enable = 1;
+    auto err = this->broadcast_socket_->setsockopt(SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int));
+    if (err != 0) {
+      this->status_set_warning("Socket unable to set reuseaddr");
+      // we can still continue
+    }
+    err = this->broadcast_socket_->setsockopt(SOL_SOCKET, SO_BROADCAST, &enable, sizeof(int));
+    if (err != 0) {
+      this->status_set_warning("Socket unable to set broadcast");
+    }
+  }
+  // create listening socket if we either want to subscribe to providers, or need to listen
+  // for ping key broadcasts.
+  if (this->should_listen_) {
+    this->listen_socket_ = socket::socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+    if (this->listen_socket_ == nullptr) {
+      this->mark_failed();
+      this->status_set_error("Could not create socket");
+      return;
+    }
+    auto err = this->listen_socket_->setblocking(false);
+    if (err < 0) {
+      ESP_LOGE(TAG, "Unable to set nonblocking: errno %d", errno);
+      this->mark_failed();
+      this->status_set_error("Unable to set nonblocking");
+      return;
+    }
+    int enable = 1;
+    err = this->listen_socket_->setsockopt(SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
+    if (err != 0) {
+      this->status_set_warning("Socket unable to set reuseaddr");
+      // we can still continue
+    }
+    struct sockaddr_in server {};
+
+    socklen_t sl = socket::set_sockaddr_any((struct sockaddr *) &server, sizeof(server), this->port_);
+    if (sl == 0) {
+      ESP_LOGE(TAG, "Socket unable to set sockaddr: errno %d", errno);
+      this->mark_failed();
+      this->status_set_error("Unable to set sockaddr");
+      return;
+    }
+
+    err = this->listen_socket_->bind((struct sockaddr *) &server, sizeof(server));
+    if (err != 0) {
+      ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
+      this->mark_failed();
+      this->status_set_error("Unable to bind socket");
+      return;
+    }
+  }
+#else
+  // 8266 and RP2040 `Duino
+  for (const auto &address : this->addresses_) {
+    auto ipaddr = IPAddress();
+    ipaddr.fromString(address.c_str());
+    this->ipaddrs_.push_back(ipaddr);
+  }
+  if (this->should_listen_)
+    this->udp_client_.begin(this->port_);
+#endif
+}
+
+void UDPComponent::init_data_() {
+  this->data_.clear();
+  if (this->rolling_code_enable_) {
+    add(this->data_, ROLLING_CODE_KEY);
+    add(this->data_, this->rolling_code_[0]);
+    add(this->data_, this->rolling_code_[1]);
+    this->increment_code_();
+  } else {
+    add(this->data_, DATA_KEY);
+  }
+  for (auto pkey : this->ping_keys_) {
+    add(this->data_, PING_KEY);
+    add(this->data_, pkey.second);
+  }
+}
+
+void UDPComponent::flush_() {
+  if (!network::is_connected() || this->data_.empty())
+    return;
+  uint32_t buffer[MAX_PACKET_SIZE / 4];
+  memset(buffer, 0, sizeof buffer);
+  // len must be a multiple of 4
+  auto header_len = round4(this->header_.size()) / 4;
+  auto len = round4(data_.size()) / 4;
+  memcpy(buffer, this->header_.data(), this->header_.size());
+  memcpy(buffer + header_len, this->data_.data(), this->data_.size());
+  if (this->is_encrypted_()) {
+    xxtea_encrypt(buffer + header_len, len, (uint32_t *) this->encryption_key_.data());
+  }
+  auto total_len = (header_len + len) * 4;
+  this->send_packet_(buffer, total_len);
+}
+
+void UDPComponent::add_binary_data_(uint8_t key, const char *id, bool data) {
+  auto len = 1 + 1 + 1 + strlen(id);
+  if (len + this->header_.size() + this->data_.size() > MAX_PACKET_SIZE) {
+    this->flush_();
+  }
+  add(this->data_, key);
+  add(this->data_, (uint8_t) data);
+  add(this->data_, id);
+}
+void UDPComponent::add_data_(uint8_t key, const char *id, float data) {
+  FuData udata{.f32 = data};
+  this->add_data_(key, id, udata.u32);
+}
+
+void UDPComponent::add_data_(uint8_t key, const char *id, uint32_t data) {
+  auto len = 4 + 1 + 1 + strlen(id);
+  if (len + this->header_.size() + this->data_.size() > MAX_PACKET_SIZE) {
+    this->flush_();
+  }
+  add(this->data_, key);
+  add(this->data_, data);
+  add(this->data_, id);
+}
+void UDPComponent::send_data_(bool all) {
+  if (!this->should_send_ || !network::is_connected())
+    return;
+  this->init_data_();
+#ifdef USE_SENSOR
+  for (auto &sensor : this->sensors_) {
+    if (all || sensor.updated) {
+      sensor.updated = false;
+      this->add_data_(SENSOR_KEY, sensor.id, sensor.sensor->get_state());
+    }
+  }
+#endif
+#ifdef USE_BINARY_SENSOR
+  for (auto &sensor : this->binary_sensors_) {
+    if (all || sensor.updated) {
+      sensor.updated = false;
+      this->add_binary_data_(BINARY_SENSOR_KEY, sensor.id, sensor.sensor->state);
+    }
+  }
+#endif
+  this->flush_();
+  this->updated_ = false;
+  this->resend_data_ = false;
+}
+
+void UDPComponent::update() {
+  this->updated_ = true;
+  this->resend_data_ = this->should_send_;
+  auto now = millis() / 1000;
+  if (this->last_key_time_ + this->ping_pong_recyle_time_ < now) {
+    this->resend_ping_key_ = this->ping_pong_enable_;
+    this->last_key_time_ = now;
+  }
+}
+
+void UDPComponent::loop() {
+  uint8_t buf[MAX_PACKET_SIZE];
+  if (this->should_listen_) {
+    for (;;) {
+#if defined(USE_SOCKET_IMPL_BSD_SOCKETS) || defined(USE_SOCKET_IMPL_LWIP_SOCKETS)
+      auto len = this->listen_socket_->read(buf, sizeof(buf));
+#else
+      auto len = this->udp_client_.parsePacket();
+      if (len > 0)
+        len = this->udp_client_.read(buf, sizeof(buf));
+#endif
+      if (len > 0) {
+        this->process_(buf, len);
+        continue;
+      }
+      break;
+    }
+  }
+  if (this->resend_ping_key_)
+    this->send_ping_pong_request_();
+  if (this->updated_) {
+    this->send_data_(this->resend_data_);
+  }
+}
+
+void UDPComponent::add_key_(const char *name, uint32_t key) {
+  if (!this->is_encrypted_())
+    return;
+  if (this->ping_keys_.count(name) == 0 && this->ping_keys_.size() == MAX_PING_KEYS) {
+    ESP_LOGW(TAG, "Ping key from %s discarded", name);
+    return;
+  }
+  this->ping_keys_[name] = key;
+  this->resend_data_ = true;
+  ESP_LOGV(TAG, "Ping key from %s now %X", name, (unsigned) key);
+}
+
+void UDPComponent::process_ping_request_(const char *name, uint8_t *ptr, size_t len) {
+  if (len != 4) {
+    ESP_LOGW(TAG, "Bad ping request");
+    return;
+  }
+  auto key = get_uint32(ptr);
+  this->add_key_(name, key);
+  ESP_LOGV(TAG, "Updated ping key for %s to %08X", name, (unsigned) key);
+}
+
+static bool process_rolling_code(Provider &provider, uint8_t *&buf, const uint8_t *end) {
+  if (end - buf < 8)
+    return false;
+  auto code0 = get_uint32(buf);
+  auto code1 = get_uint32(buf);
+  if (code1 < provider.last_code[1] || (code1 == provider.last_code[1] && code0 <= provider.last_code[0])) {
+    ESP_LOGW(TAG, "Rolling code for %s %08lX:%08lX is old", provider.name, (unsigned long) code1,
+             (unsigned long) code0);
+    return false;
+  }
+  provider.last_code[0] = code0;
+  provider.last_code[1] = code1;
+  return true;
+}
+
+/**
+ * Process a received packet
+ */
+void UDPComponent::process_(uint8_t *buf, const size_t len) {
+  auto ping_key_seen = !this->ping_pong_enable_;
+  if (len < 8) {
+    return ESP_LOGV(TAG, "Bad length %zu", len);
+  }
+  char namebuf[256]{};
+  uint8_t byte;
+  uint8_t *start_ptr = buf;
+  const uint8_t *end = buf + len;
+  FuData rdata{};
+  auto magic = get_uint16(buf);
+  if (magic != MAGIC_NUMBER && magic != MAGIC_PING)
+    return ESP_LOGV(TAG, "Bad magic %X", magic);
+
+  auto hlen = *buf++;
+  if (hlen > len - 3) {
+    return ESP_LOGV(TAG, "Bad hostname length %u > %zu", hlen, len - 3);
+  }
+  memcpy(namebuf, buf, hlen);
+  if (strcmp(this->name_, namebuf) == 0) {
+    return ESP_LOGV(TAG, "Ignoring our own data");
+  }
+  buf += hlen;
+  if (magic == MAGIC_PING)
+    return this->process_ping_request_(namebuf, buf, end - buf);
+  if (round4(len) != len) {
+    return ESP_LOGW(TAG, "Bad length %zu", len);
+  }
+  hlen = round4(hlen + 3);
+  buf = start_ptr + hlen;
+  if (buf == end) {
+    return ESP_LOGV(TAG, "No data after header");
+  }
+
+  if (this->providers_.count(namebuf) == 0) {
+    return ESP_LOGVV(TAG, "Unknown hostname %s", namebuf);
+  }
+  auto &provider = this->providers_[namebuf];
+  // if encryption not used with this host, ping check is pointless since it would be easily spoofed.
+  if (provider.encryption_key.empty())
+    ping_key_seen = true;
+
+  ESP_LOGV(TAG, "Found hostname %s", namebuf);
+#ifdef USE_SENSOR
+  auto &sensors = this->remote_sensors_[namebuf];
+#endif
+#ifdef USE_BINARY_SENSOR
+  auto &binary_sensors = this->remote_binary_sensors_[namebuf];
+#endif
+
+  if (!provider.encryption_key.empty()) {
+    xxtea_decrypt((uint32_t *) buf, (end - buf) / 4, (uint32_t *) provider.encryption_key.data());
+  }
+  byte = *buf++;
+  if (byte == ROLLING_CODE_KEY) {
+    if (!process_rolling_code(provider, buf, end))
+      return;
+  } else if (byte != DATA_KEY) {
+    return ESP_LOGV(TAG, "Expected rolling_key or data_key, got %X", byte);
+  }
+  while (buf < end) {
+    byte = *buf++;
+    if (byte == ZERO_FILL_KEY)
+      continue;
+    if (byte == PING_KEY) {
+      if (end - buf < 4) {
+        return ESP_LOGV(TAG, "PING_KEY requires 4 more bytes");
+      }
+      auto key = get_uint32(buf);
+      if (key == this->ping_key_) {
+        ping_key_seen = true;
+        ESP_LOGV(TAG, "Found good ping key %X", (unsigned) key);
+      } else {
+        ESP_LOGV(TAG, "Unknown ping key %X", (unsigned) key);
+      }
+      continue;
+    }
+    if (!ping_key_seen) {
+      ESP_LOGW(TAG, "Ping key not seen");
+      this->resend_ping_key_ = true;
+      break;
+    }
+    if (byte == BINARY_SENSOR_KEY) {
+      if (end - buf < 3) {
+        return ESP_LOGV(TAG, "Binary sensor key requires at least 3 more bytes");
+      }
+      rdata.u32 = *buf++;
+    } else if (byte == SENSOR_KEY) {
+      if (end - buf < 6) {
+        return ESP_LOGV(TAG, "Sensor key requires at least 6 more bytes");
+      }
+      rdata.u32 = get_uint32(buf);
+    } else {
+      return ESP_LOGW(TAG, "Unknown key byte %X", byte);
+    }
+
+    hlen = *buf++;
+    if (end - buf < hlen) {
+      return ESP_LOGV(TAG, "Name length of %u not available", hlen);
+    }
+    memset(namebuf, 0, sizeof namebuf);
+    memcpy(namebuf, buf, hlen);
+    ESP_LOGV(TAG, "Found sensor key %d, id %s, data %lX", byte, namebuf, (unsigned long) rdata.u32);
+    buf += hlen;
+#ifdef USE_SENSOR
+    if (byte == SENSOR_KEY && sensors.count(namebuf) != 0)
+      sensors[namebuf]->publish_state(rdata.f32);
+#endif
+#ifdef USE_BINARY_SENSOR
+    if (byte == BINARY_SENSOR_KEY && binary_sensors.count(namebuf) != 0)
+      binary_sensors[namebuf]->publish_state(rdata.u32 != 0);
+#endif
+  }
+}
+
+void UDPComponent::dump_config() {
+  ESP_LOGCONFIG(TAG, "UDP:");
+  ESP_LOGCONFIG(TAG, "  Port: %u", this->port_);
+  ESP_LOGCONFIG(TAG, "  Encrypted: %s", YESNO(this->is_encrypted_()));
+  ESP_LOGCONFIG(TAG, "  Ping-pong: %s", YESNO(this->ping_pong_enable_));
+  for (const auto &address : this->addresses_)
+    ESP_LOGCONFIG(TAG, "  Address: %s", address.c_str());
+#ifdef USE_SENSOR
+  for (auto sensor : this->sensors_)
+    ESP_LOGCONFIG(TAG, "  Sensor: %s", sensor.id);
+#endif
+#ifdef USE_BINARY_SENSOR
+  for (auto sensor : this->binary_sensors_)
+    ESP_LOGCONFIG(TAG, "  Binary Sensor: %s", sensor.id);
+#endif
+  for (const auto &host : this->providers_) {
+    ESP_LOGCONFIG(TAG, "  Remote host: %s", host.first.c_str());
+    ESP_LOGCONFIG(TAG, "    Encrypted: %s", YESNO(!host.second.encryption_key.empty()));
+#ifdef USE_SENSOR
+    for (const auto &sensor : this->remote_sensors_[host.first.c_str()])
+      ESP_LOGCONFIG(TAG, "    Sensor: %s", sensor.first.c_str());
+#endif
+#ifdef USE_BINARY_SENSOR
+    for (const auto &sensor : this->remote_binary_sensors_[host.first.c_str()])
+      ESP_LOGCONFIG(TAG, "    Binary Sensor: %s", sensor.first.c_str());
+#endif
+  }
+}
+void UDPComponent::increment_code_() {
+  if (this->rolling_code_enable_) {
+    if (++this->rolling_code_[0] == 0) {
+      this->rolling_code_[1]++;
+      this->pref_.save(&this->rolling_code_[1]);
+    }
+  }
+}
+void UDPComponent::send_packet_(void *data, size_t len) {
+#if defined(USE_SOCKET_IMPL_BSD_SOCKETS) || defined(USE_SOCKET_IMPL_LWIP_SOCKETS)
+  for (const auto &saddr : this->sockaddrs_) {
+    auto result = this->broadcast_socket_->sendto(data, len, 0, &saddr, sizeof(saddr));
+    if (result < 0)
+      ESP_LOGW(TAG, "sendto() error %d", errno);
+  }
+#else
+  auto iface = IPAddress(0, 0, 0, 0);
+  for (const auto &saddr : this->ipaddrs_) {
+    if (this->udp_client_.beginPacketMulticast(saddr, this->port_, iface, 128) != 0) {
+      this->udp_client_.write((const uint8_t *) data, len);
+      auto result = this->udp_client_.endPacket();
+      if (result == 0)
+        ESP_LOGW(TAG, "udp.write() error");
+    }
+  }
+#endif
+}
+
+void UDPComponent::send_ping_pong_request_() {
+  if (!this->ping_pong_enable_ || !network::is_connected())
+    return;
+  this->ping_key_ = random_uint32();
+  this->ping_header_.clear();
+  add(this->ping_header_, MAGIC_PING);
+  add(this->ping_header_, this->name_);
+  add(this->ping_header_, this->ping_key_);
+  this->send_packet_(this->ping_header_.data(), this->ping_header_.size());
+  this->resend_ping_key_ = false;
+  ESP_LOGV(TAG, "Sent new ping request %08X", (unsigned) this->ping_key_);
+}
+}  // namespace udp
+}  // namespace esphome

esphome/components/udp/udp_component.h

@@ -0,0 +1,158 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#ifdef USE_SENSOR
+#include "esphome/components/sensor/sensor.h"
+#endif
+#ifdef USE_BINARY_SENSOR
+#include "esphome/components/binary_sensor/binary_sensor.h"
+#endif
+#if defined(USE_SOCKET_IMPL_BSD_SOCKETS) || defined(USE_SOCKET_IMPL_LWIP_SOCKETS)
+#include "esphome/components/socket/socket.h"
+#else
+#include <WiFiUdp.h>
+#endif
+#include <vector>
+#include <map>
+
+namespace esphome {
+namespace udp {
+
+struct Provider {
+  std::vector<uint8_t> encryption_key;
+  const char *name;
+  uint32_t last_code[2];
+};
+
+#ifdef USE_SENSOR
+struct Sensor {
+  sensor::Sensor *sensor;
+  const char *id;
+  bool updated;
+};
+#endif
+#ifdef USE_BINARY_SENSOR
+struct BinarySensor {
+  binary_sensor::BinarySensor *sensor;
+  const char *id;
+  bool updated;
+};
+#endif
+
+class UDPComponent : public PollingComponent {
+ public:
+  void setup() override;
+  void loop() override;
+  void update() override;
+  void dump_config() override;
+
+#ifdef USE_SENSOR
+  void add_sensor(const char *id, sensor::Sensor *sensor) {
+    Sensor st{sensor, id, true};
+    this->sensors_.push_back(st);
+  }
+  void add_remote_sensor(const char *hostname, const char *remote_id, sensor::Sensor *sensor) {
+    this->add_provider(hostname);
+    this->remote_sensors_[hostname][remote_id] = sensor;
+  }
+#endif
+#ifdef USE_BINARY_SENSOR
+  void add_binary_sensor(const char *id, binary_sensor::BinarySensor *sensor) {
+    BinarySensor st{sensor, id, true};
+    this->binary_sensors_.push_back(st);
+  }
+
+  void add_remote_binary_sensor(const char *hostname, const char *remote_id, binary_sensor::BinarySensor *sensor) {
+    this->add_provider(hostname);
+    this->remote_binary_sensors_[hostname][remote_id] = sensor;
+  }
+#endif
+  void add_address(const char *addr) { this->addresses_.emplace_back(addr); }
+  void set_port(uint16_t port) { this->port_ = port; }
+  float get_setup_priority() const override { return setup_priority::AFTER_WIFI; }
+
+  void add_provider(const char *hostname) {
+    if (this->providers_.count(hostname) == 0) {
+      Provider provider;
+      provider.encryption_key = std::vector<uint8_t>{};
+      provider.last_code[0] = 0;
+      provider.last_code[1] = 0;
+      provider.name = hostname;
+      this->providers_[hostname] = provider;
+#ifdef USE_SENSOR
+      this->remote_sensors_[hostname] = std::map<std::string, sensor::Sensor *>();
+#endif
+#ifdef USE_BINARY_SENSOR
+      this->remote_binary_sensors_[hostname] = std::map<std::string, binary_sensor::BinarySensor *>();
+#endif
+    }
+  }
+
+  void set_encryption_key(std::vector<uint8_t> key) { this->encryption_key_ = std::move(key); }
+  void set_rolling_code_enable(bool enable) { this->rolling_code_enable_ = enable; }
+  void set_ping_pong_enable(bool enable) { this->ping_pong_enable_ = enable; }
+  void set_ping_pong_recycle_time(uint32_t recycle_time) { this->ping_pong_recyle_time_ = recycle_time; }
+  void set_provider_encryption(const char *name, std::vector<uint8_t> key) {
+    this->providers_[name].encryption_key = std::move(key);
+  }
+
+ protected:
+  void send_data_(bool all);
+  void process_(uint8_t *buf, size_t len);
+  void flush_();
+  void add_data_(uint8_t key, const char *id, float data);
+  void add_data_(uint8_t key, const char *id, uint32_t data);
+  void increment_code_();
+  void add_binary_data_(uint8_t key, const char *id, bool data);
+  void init_data_();
+
+  bool updated_{};
+  uint16_t port_{18511};
+  uint32_t ping_key_{};
+  uint32_t rolling_code_[2]{};
+  bool rolling_code_enable_{};
+  bool ping_pong_enable_{};
+  uint32_t ping_pong_recyle_time_{};
+  uint32_t last_key_time_{};
+  bool resend_ping_key_{};
+  bool resend_data_{};
+  bool should_send_{};
+  const char *name_{};
+  bool should_listen_{};
+  ESPPreferenceObject pref_;
+
+#if defined(USE_SOCKET_IMPL_BSD_SOCKETS) || defined(USE_SOCKET_IMPL_LWIP_SOCKETS)
+  std::unique_ptr<socket::Socket> broadcast_socket_ = nullptr;
+  std::unique_ptr<socket::Socket> listen_socket_ = nullptr;
+  std::vector<struct sockaddr> sockaddrs_{};
+#else
+  std::vector<IPAddress> ipaddrs_{};
+  WiFiUDP udp_client_{};
+#endif
+  std::vector<uint8_t> encryption_key_{};
+  std::vector<std::string> addresses_{};
+
+#ifdef USE_SENSOR
+  std::vector<Sensor> sensors_{};
+  std::map<std::string, std::map<std::string, sensor::Sensor *>> remote_sensors_{};
+#endif
+#ifdef USE_BINARY_SENSOR
+  std::vector<BinarySensor> binary_sensors_{};
+  std::map<std::string, std::map<std::string, binary_sensor::BinarySensor *>> remote_binary_sensors_{};
+#endif
+
+  std::map<std::string, Provider> providers_{};
+  std::vector<uint8_t> ping_header_{};
+  std::vector<uint8_t> header_{};
+  std::vector<uint8_t> data_{};
+  std::map<const char *, uint32_t> ping_keys_{};
+  void add_key_(const char *name, uint32_t key);
+  void send_ping_pong_request_();
+  void send_packet_(void *data, size_t len);
+  void process_ping_request_(const char *name, uint8_t *ptr, size_t len);
+
+  inline bool is_encrypted_() { return !this->encryption_key_.empty(); }
+};
+
+}  // namespace udp
+}  // namespace esphome

tests/components/udp/common.yaml

@@ -0,0 +1,35 @@
+wifi:
+  ssid: MySSID
+  password: password1
+
+udp:
+  update_interval: 5s
+  encryption: "our key goes here"
+  rolling_code_enable: true
+  ping_pong_enable: true
+  binary_sensors:
+    - binary_sensor_id1
+    - id: binary_sensor_id1
+      broadcast_id: other_id
+  sensors:
+    - sensor_id1
+    - id: sensor_id1
+      broadcast_id: other_id
+  providers:
+    - name: some-device-name
+      encryption: "their key goes here"
+
+sensor:
+  - platform: template
+    id: sensor_id1
+  - platform: udp
+    provider: some-device-name
+    id: our_id
+    remote_id: some_sensor_id
+
+binary_sensor:
+  - platform: udp
+    provider: unencrypted-device
+    id: other_binary_sensor_id
+  - platform: template
+    id: binary_sensor_id1

tests/components/udp/test.bk72xx-ard.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.esp32-ard.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.esp32-c3-ard.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.esp32-c3-idf.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.esp32-idf.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.esp8266-ard.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml

tests/components/udp/test.host.yaml

@@ -0,0 +1,4 @@
+packages:
+  common: !include common.yaml
+
+wifi: !remove

tests/components/udp/test.rp2040-ard.yaml

@@ -0,0 +1 @@
+<<: !include common.yaml