fixed kwargs not being expanded for actions on bit registers, adjusted tests to catch this issue (#2161)

Author: sumguytho

pymodbus/datastore/simulator.py

@@ -434,7 +434,7 @@ class ModbusSimulatorContext(ModbusBaseSlaveContext):
             "write": [   --> allow write, efault is ReadOnly
                 [5, 5]  --> start, end bytes, repeated as needed
             ],
-            "bits": [  --> Define bits (1 register == 1 byte)
+            "bits": [  --> Define bits (1 register == 2 bytes)
                 [30, 31],  --> start, end registers, repeated as needed
                 {"addr": [32, 34], "value": 0xF1},  --> with value
                 {"addr": [35, 36], "action": "increment"},  --> with action
@@ -601,8 +601,9 @@ def getValues(self, func_code, address, count=1):
             for i in range(real_address, real_address + reg_count):
                 reg = self.registers[i]
                 if reg.action:
+                    kwargs = reg.action_kwargs or {}
                     self.action_methods[reg.action](
-                        self.registers, i, reg, reg.action_kwargs
+                        self.registers, i, reg, **kwargs
                     )
                 self.registers[i].count_read += 1
                 while count and bit_index < 16:

test/sub_server/test_simulator.py

@@ -528,7 +528,12 @@ def test_simulator_action_increment(
         exc_simulator.registers[30].value = regs[0]
         exc_simulator.registers[31].value = regs[1]
         for expect_value in expected:
-            regs = exc_simulator.getValues(FX_READ_REG, 30, reg_count)
+            if celltype != CellType.BITS:
+                regs = exc_simulator.getValues(FX_READ_REG, 30, reg_count)
+            else:
+                reg_bits = exc_simulator.getValues(FX_READ_BIT, 30 * 16, 16)
+                reg_value = sum([ bit * 2 ** i for i, bit in enumerate(reg_bits)])
+                regs = [reg_value]
             if reg_count == 1:
                 assert expect_value == regs[0], f"type({celltype})"
             else:
@@ -563,7 +568,12 @@ def test_simulator_action_random(self, celltype, minval, maxval):
         is_int = celltype != CellType.FLOAT32
         reg_count = 1 if celltype in (CellType.BITS, CellType.UINT16) else 2
         for _i in range(100):
-            regs = exc_simulator.getValues(FX_READ_REG, 30, reg_count)
+            if celltype != CellType.BITS:
+                regs = exc_simulator.getValues(FX_READ_REG, 30, reg_count)
+            else:
+                reg_bits = exc_simulator.getValues(FX_READ_BIT, 30 * 16, 16)
+                reg_value = sum([ bit * 2 ** i for i, bit in enumerate(reg_bits)])
+                regs = [reg_value]
             if reg_count == 1:
                 new_value = regs[0]
             else: