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These functions have no meaning in RTU so it's better to specialize the names and remove them from the backend. - remove the functions from the backend - update tests to handle RTU mode (master and slave) - add command line options to tests (rtu or tcp)
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- check strlcpy in configure.ac - test for empty device string - test truncated device string
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modbus_set_slave must be used to set the slave ID of the remote device to talk in master mode and to set the internal slave ID in slave mode. If you talk to several devices, you need to call modbus_set_slave each time the following requests must be sent to another device.
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- return only useful data client side - available in TCP when a gateway to RTU is used - need to add isolated handling of indication/confirmation messages