First working version

.gitignore

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+# Gitignore settings for ESPHome
+# This is an example and may include too much for your use-case.
+# You can modify this file to suit your needs.
+.esphome/
+secrets.yaml

desk_height_sensor.h

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+#include "esphome.h"
+#include <bitset>
+
+class DeskHeightSensor : public Component, public UARTDevice, public Sensor
+{
+public:
+  DeskHeightSensor(UARTComponent *parent) : UARTDevice(parent) {}
+
+  float value = 0;
+  float lastPublished = -1;
+  unsigned long history[5];
+
+  int msg_len = 0;
+  unsigned long msg_type;
+  bool valid = false;
+
+  float get_setup_priority() const override { return esphome::setup_priority::DATA; }
+
+  int hex_to_int(byte s)
+  {
+    std::bitset<8> b(s);
+
+    if (b[0] && b[1] && b[2] && b[3] && b[4] && b[5] && !b[6])
+    {
+      return 0;
+    }
+    if (not b[0] && b[1] && b[2] && !b[3] && !b[4] && !b[5] && !b[6])
+    {
+      return 1;
+    }
+    if (b[0] && b[1] && !b[2] && b[3] && b[4] && !b[5] && b[6])
+    {
+      return 2;
+    }
+    if (b[0] && b[1] && b[2] && b[3] && !b[4] && !b[5] && b[6])
+    {
+      return 3;
+    }
+    if (not b[0] && b[1] && b[2] && !b[3] && !b[4] && b[5] && b[6])
+    {
+      return 4;
+    }
+    if (b[0] && !b[1] && b[2] && b[3] && !b[4] && b[5] && b[6])
+    {
+      return 5;
+    }
+    if (b[0] && !b[1] && b[2] && b[3] && b[4] && b[5] && b[6])
+    {
+      return 6;
+    }
+    if (b[0] && b[1] && b[2] && !b[3] && !b[4] && !b[5] && !b[6])
+    {
+      return 7;
+    }
+    if (b[0] && b[1] && b[2] && b[3] && b[4] && b[5] && b[6])
+    {
+      return 8;
+    }
+    if (b[0] && b[1] && b[2] && b[3] && !b[4] && b[5] && b[6])
+    {
+      return 9;
+    }
+    if (!b[0] && !b[1] && !b[2] && !b[3] && !b[4] && !b[5] && b[6])
+    {
+      return 10;
+    }
+    return 0;
+  }
+
+  bool is_decimal(byte b)
+  {
+    return (b & 0x80) == 0x80;
+  }
+
+  void setup() override
+  {
+    // nothing to do here
+  }
+
+  void loop() override
+  {
+    while (available() > 0)
+    {
+      byte incomingByte = read();
+      // ESP_LOGD("DEBUG", "Incoming byte is: %08x", incomingByte);
+
+      // First byte, start of a packet
+      if (incomingByte == 0x9b)
+      {
+        // Reset message length
+        msg_len = 0;
+        valid = false;
+      }
+
+      // Second byte defines the message length
+      if (history[0] == 0x9b)
+      {
+        msg_len = (int)incomingByte;
+      }
+
+      // Third byte is message type
+      if (history[1] == 0x9b)
+      {
+        msg_type = incomingByte;
+      }
+
+      // Fourth byte is first height digit, if msg type 0x12 & msg len 7
+      if (history[2] == 0x9b)
+      {
+
+        if (msg_type == 0x12 && msg_len == 7)
+        {
+          // Empty height
+          if (incomingByte == 0)
+          {
+             //ESP_LOGD("DEBUG", "Height 1 is EMPTY -> 0x%02x", incomingByte);
+             //deskSerial.write(command_wakeup, sizeof(command_wakeup));
+          }
+          else if (hex_to_int(incomingByte) == 0)
+          {
+             //ESP_LOGD("DEBUG", "Invalid height 1 -> 0x%02x", incomingByte);
+             //deskSerial.write(command_wakeup, sizeof(command_wakeup));
+          }
+          else
+          {
+            valid = true;
+          //   ESP_LOGD("DEBUG", "Height 1 is: 0x%02x", incomingByte);
+          }
+        }
+      }
+
+      // Fifth byte is second height digit
+      if (history[3] == 0x9b)
+      {
+        if (valid == true)
+        {
+           //ESP_LOGD("DEBUG", "Height 2 is: 0x%02x", incomingByte);
+        }
+      }
+
+      // Sixth byte is third height digit
+      if (history[4] == 0x9b)
+      {
+        if (valid == true)
+        {
+          int height1 = hex_to_int(history[1]) * 100;
+          int height2 = hex_to_int(history[0]) * 10;
+          int height3 = hex_to_int(incomingByte);
+          if (height2 == 100) // check if 'number' is a hyphen, return value 10 multiplied by 10
+          {
+
+          }
+          else
+          {
+            float finalHeight = height1 + height2 + height3;
+            if (is_decimal(history[0]))
+            {
+              finalHeight = finalHeight / 10;
+            }
+            value = finalHeight;
+            // ESP_LOGD("DeskHeightSensor", "Current height is: %f", finalHeight);
+          }
+        }
+      }
+
+
+
+      // Save byte buffer to history arrary
+      history[4] = history[3];
+      history[3] = history[2];
+      history[2] = history[1];
+      history[1] = history[0];
+      history[0] = incomingByte;
+
+           // End byte
+      if (incomingByte == 0x9d)
+      {
+        if (value && value != lastPublished)
+        {
+          publish_state(value);
+            lastPublished = value;
+        }
+      }
+    }
+  }
+};

flexispot-e7.yaml

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+esphome:
+  name: flexispot-e7
+  comment: Flexispot E7
+  # includes:
+  #   - desk_height_sensor.h
+
+esp32:
+  board: az-delivery-devkit-v4
+  framework:
+    type: arduino
+
+logger:
+
+ota:
+  password: ''
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+
+  ap:
+    ssid: 'Flexispot-E7 Fallback Hotspot'
+    password: !secret ap_password
+
+web_server:
+  port: 80
+
+captive_portal:
+
+uart:
+  id: desk_uart
+  baud_rate: 9600
+  tx_pin: GPIO17
+  rx_pin: GPIO16
+
+sensor:
+  - platform: wifi_signal
+    name: 'WiFi Signal'
+    update_interval: 60s
+
+  - platform: uptime
+    name: Uptime
+
+  # - platform: custom
+  #   lambda: |-
+  #     auto desk_height_sensor = new DeskHeightSensor(id(desk_uart));
+  #     App.register_component(desk_height_sensor);
+  #     return {desk_height_sensor};
+  #   sensors:
+  #     id: 'desk_height'
+  #     name: Desk Height
+  #     unit_of_measurement: cm
+  #     accuracy_decimals: 1
+  #     icon: 'mdi:counter'
+
+switch:
+  # - platform: gpio
+  #   name: 'Virtual Screen'
+  #   pin:
+  #     number: GPIO23
+  #     mode: OUTPUT
+  #   restore_mode: ALWAYS_OFF
+  #   internal: true
+
+  - platform: uart
+    name: 'Preset 1'
+    id: switch_preset1
+    icon: mdi:numeric-1-box
+    data: [0x9b, 0x06, 0x02, 0x04, 0x00, 0xac, 0xa3, 0x9d]
+    uart_id: desk_uart
+
+  - platform: uart
+    name: 'Preset 2'
+    id: switch_preset2
+    icon: mdi:numeric-2-box
+    data: [0x9b, 0x06, 0x02, 0x08, 0x00, 0xac, 0xa6, 0x9d]
+    uart_id: desk_uart
+
+  - platform: uart
+    name: 'Sit' # Preset 3 on some control panels
+    id: switch_sit
+    icon: mdi:chair-rolling
+    data: [0x9b, 0x06, 0x02, 0x00, 0x01, 0xac, 0x60, 0x9d]
+    uart_id: desk_uart
+
+  - platform: uart
+    name: 'Stand' # Not available for all control panels
+    id: switch_stand
+    icon: mdi:human-handsup
+    data: [0x9b, 0x06, 0x02, 0x10, 0x00, 0xac, 0xac, 0x9d]
+    uart_id: desk_uart
+
+  # - platform: uart
+  #   name: '(wake up)' # Not available on all control panels
+  #   id: switch_wake_up
+  #   icon: mdi:gesture-tap-button
+  #   data: [0x9b, 0x06, 0x02, 0x00, 0x00, 0x6c, 0xa1, 0x9d]
+  #   uart_id: desk_uart