Some fixes (integers for speed, Serial returns back to HA etc.)

esp-home-rewrite.yaml

@@ -131,6 +131,20 @@ uart:
   # Uncomment to log raw Arduino traffic:
   # debug:
   #   direction: BOTH
+  on_data:
+    - lambda: |-
+        for (uint8_t b : x) {
+          if (b == '\n') {
+            std::string &buf = id(uart_rx_buf);
+            if (!buf.empty() && buf.back() == '\r') buf.pop_back();
+            if (!buf.empty() && buf != "OK" && buf != "PONG") {
+              id(arduino_last_message).publish_state(buf);
+            }
+            buf.clear();
+          } else if (id(uart_rx_buf).size() < 128) {
+            id(uart_rx_buf) += static_cast<char>(b);
+          }
+        }
 
 # ---------------------------------------------------------------------------
 # Connectivity diagnostics
@@ -259,6 +273,11 @@ text_sensor:
       name: SSID
       entity_category: diagnostic
 
+  - platform: template
+    id: arduino_last_message
+    name: Arduino Last Message
+    entity_category: diagnostic
+
 # ---------------------------------------------------------------------------
 # Gauge target numbers
 # ---------------------------------------------------------------------------
@@ -702,11 +721,26 @@ button:
           id: arduino_uart
           data: "HOMEALL\n"
 
+# ---------------------------------------------------------------------------
+# Periodic auto-rezero
+# ---------------------------------------------------------------------------
+
+interval:
+  - interval: ${rezero_interval}
+    then:
+      - uart.write:
+          id: arduino_uart
+          data: "HOMEALL\n"
+
 # ---------------------------------------------------------------------------
 # Gauge light state cache
 # ---------------------------------------------------------------------------
 
 globals:
+  - id: uart_rx_buf
+    type: std::string
+    restore_value: no
+    initial_value: '""'
   - id: vfd_text_value
     type: std::string
     restore_value: no
@@ -736,35 +770,35 @@ globals:
     restore_value: no
     initial_value: ${gauge3_min}
   - id: gauge0_speed_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge0_default_speed}
   - id: gauge0_accel_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge0_default_accel}
   - id: gauge1_speed_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge1_default_speed}
   - id: gauge1_accel_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge1_default_accel}
   - id: gauge2_speed_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge2_default_speed}
   - id: gauge2_accel_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge2_default_accel}
   - id: gauge3_speed_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge3_default_speed}
   - id: gauge3_accel_value
-    type: float
+    type: int
     restore_value: no
     initial_value: ${gauge3_default_accel}
   - id: gauge0_bl_r