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Thanks to paperwork
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Thanks to Rüdiger Ranft for the idea.
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Related to 52ab1bbea760ed8eaca184f7d875a2f52a116d0f. The arguments have been changed (see documentation). https://groups.google.com/d/msg/libmodbus/aXO8nBzW4Ew/uVGTDmvvBAAJ
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Linking failed in Visual Studio due to unresolved bswap_16().
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The file was copied in wrong place too (include/libmodbus). Thanks to Daniel Sutcliffe.
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This allows to place the coils/registers at any virtual start address, not only at address 0. This can be useful e.g. when the server has to fulfill a specification in which registers are expected at predefined locations. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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Thanks to @lipengin1975 for reporting this issue. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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According to the Modbus specification (http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf, section 2.1) a Modbus RTU master can send a broadcast to all of it's slaves. This broadcasts can only be write requests as otherwise collisions could occur, eg. on a RS-485 bus. When receiving such a broadcast, the slave should process the request as usual, but must not reply anything, neither a normal response nor an exception reply in case of an error. Adjust the unit test for this case, too. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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Do not allow raw request length longer than the PDU size plus the additional requested slave address byte. Without this check modbus_send_raw_request could be used to trigger a buffer overflow on the stack since the parameter is passed unchecked to memcpy. Thanks to Hanno Neuer for spotting this security flaw. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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This replaces the lengthy license text headers with a short and standardized license tag. See http://spdx.org for details. This is useful e.g. for license compliance tools which scan through files and generate a report of the licenses used in a project. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
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This change has introduced by 83c34102. Fix unit tests on some systems.
