Modbus controller (#1779)

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

tests/test5.yaml

@@ -36,6 +36,14 @@ i2c:
 
 modbus:
   uart_id: uart1
+  flow_control_pin: 5
+  id: mod_bus1
+
+modbus_controller:
+  - id: modbus_controller_test
+    address: 0x2
+    modbus_id: mod_bus1
+
 
 binary_sensor:
   - platform: gpio
@@ -150,6 +158,14 @@ sensor:
       name: "SelecEM2M Maximum Demand Apparent Power"
       disabled_by_default: true
 
+  - id: battery_voltage
+    name: "Battery voltage2"
+    platform: modbus_controller
+    modbus_controller_id: modbus_controller_test
+    address: 0x331A
+    register_type: read
+    value_type: U_WORD
+
   - platform: t6615
     uart_id: uart2
     co2: