Rtop 58 plugin modbus slave

[marconetsf]

This pull request contains the following changes:

Define the folder shared as a module that can be imported within any example or plugin folder.

This folder contains python_plugin_types.py that offer functions to handle C Runtime arguments and access its buffers.

Now it is possible to import python_plugin_types in new plugins files using the following syntax

from shared.python_plugin_types import ...

Major changes in SafeBufferAccess class:

New methods were added and some of them were changed.

Added methods

# bool buffers
def read_bool_input(self, buffer_idx, bit_idx, thread_safe=True):
def read_bool_output(self, buffer_idx, bit_idx, thread_safe=True):
def write_bool_output(self, buffer_idx, bit_idx, value, thread_safe=True):

# byte buffers
def read_byte_input(self, buffer_idx, thread_safe=True):
def write_byte_output(self, buffer_idx, value, thread_safe=True):
def read_byte_output(self, buffer_idx, thread_safe=True):

# int buffers
def read_int_input(self, buffer_idx, thread_safe=True):
def write_int_output(self, buffer_idx, value, thread_safe=True):
def read_int_output(self, buffer_idx, thread_safe=True):

# dint buffers
def read_dint_input(self, buffer_idx, thread_safe=True):
def write_dint_output(self, buffer_idx, value, thread_safe=True):
def read_dint_output(self, buffer_idx, thread_safe=True):

# lint buffers
def read_lint_input(self, buffer_idx, thread_safe=True):
def write_lint_output(self, buffer_idx, value, thread_safe=True):
def read_lint_output(self, buffer_idx, thread_safe=True):

# int memory buffers
def read_int_memory(self, buffer_idx, thread_safe=True):
def write_int_memory(self, buffer_idx, value, thread_safe=True):

# dint memory buffers
def read_dint_memory(self, buffer_idx, thread_safe=True):
def write_dint_memory(self, buffer_idx, value, thread_safe=True):

# lint memory buffers
def read_lint_memory(self, buffer_idx, thread_safe=True):
def write_lint_memory(self, buffer_idx, value, thread_safe=True):

# mutext controllers
def acquire_mutex(self):
def release_mutex(self):

# batches functions
def batch_read_values(self, operations):
def batch_write_values(self, operations):
def batch_mixed_operations(self, read_operations, write_operations):

Note: Now read and write functions allow you to decide if you want to acquire mutex internally or not setting the parameter thread_safe as true of false. By default it is true.

Modbus Slave Plugin added

This plugin allows runtime data to be safely accessed through modbus tcp masters.

This plugin uses python_plugin_types.py classes and methods to get and set runtime's buffers values.

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[lucasbutzke]

Maybe switch to logging

[lucasbutzke]

Maybe use logging instead of print