Add SML (Smart Message Language) platform for energy meters (#2396)

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

esphome/components/sml/__init__.py

@@ -0,0 +1,38 @@
+import re
+
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import uart
+from esphome.const import CONF_ID
+
+CODEOWNERS = ["@alengwenus"]
+
+DEPENDENCIES = ["uart"]
+
+sml_ns = cg.esphome_ns.namespace("sml")
+Sml = sml_ns.class_("Sml", cg.Component, uart.UARTDevice)
+MULTI_CONF = True
+
+CONF_SML_ID = "sml_id"
+CONF_OBIS_CODE = "obis_code"
+CONF_SERVER_ID = "server_id"
+
+CONFIG_SCHEMA = cv.Schema(
+    {
+        cv.GenerateID(): cv.declare_id(Sml),
+    }
+).extend(uart.UART_DEVICE_SCHEMA)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await uart.register_uart_device(var, config)
+
+
+def obis_code(value):
+    value = cv.string(value)
+    match = re.match(r"^\d{1,3}-\d{1,3}:\d{1,3}\.\d{1,3}\.\d{1,3}$", value)
+    if match is None:
+        raise cv.Invalid(f"{value} is not a valid OBIS code")
+    return value