Pylontech integration (solar battery bank) (#4688)

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

esphome/components/pylontech/pylontech.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/defines.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace pylontech {
+
+static const uint8_t NUM_BUFFERS = 20;
+static const uint8_t TEXT_SENSOR_MAX_LEN = 8;
+
+class PylontechListener {
+ public:
+  struct LineContents {
+    int bat_num = 0, volt, curr, tempr, tlow, thigh, vlow, vhigh, coulomb, mostempr;
+    char base_st[TEXT_SENSOR_MAX_LEN], volt_st[TEXT_SENSOR_MAX_LEN], curr_st[TEXT_SENSOR_MAX_LEN],
+        temp_st[TEXT_SENSOR_MAX_LEN];
+  };
+
+  virtual void on_line_read(LineContents *line);
+  virtual void dump_config();
+};
+
+class PylontechComponent : public PollingComponent, public uart::UARTDevice {
+ public:
+  PylontechComponent();
+
+  /// Schedule data readings.
+  void update() override;
+  /// Read data once available
+  void loop() override;
+  /// Setup the sensor and test for a connection.
+  void setup() override;
+  void dump_config() override;
+
+  float get_setup_priority() const override;
+
+  void register_listener(PylontechListener *listener) { this->listeners_.push_back(listener); }
+
+ protected:
+  void process_line_(std::string &buffer);
+
+  // ring buffer
+  std::string buffer_[NUM_BUFFERS];
+  int buffer_index_write_ = 0;
+  int buffer_index_read_ = 0;
+
+  std::vector<PylontechListener *> listeners_{};
+};
+
+}  // namespace pylontech
+}  // namespace esphome