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17 lines
780 B
Markdown
17 lines
780 B
Markdown
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Used with **esp-idf**, **libcurl** needs some paches.
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The problem with **Connection already in progress** is caused by the fact that the lwip sockets starts at `LWIP_SOCKET_OFFSET`.
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`FD_SET`/`FD_GET` macros take this into account when operating on fd sets: `LWIP_SOCKET_OFFSET` is subtracted from fd number, and the resulting value as used as bit offset in fd set.
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In curl (file lib/select.h), the macro `#define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))` checks the valid socket and fails with esp-idf lwip socket.
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This macro has to be changed to:
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`#define VALID_SOCK(s) (((s) - LWIP_SOCKET_OFFSET >= 0) && ((s) - LWIP_SOCKET_OFFSET < FD_SETSIZE))`
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then everything works as expected.
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Only directories **lib** and **include** from curl repository needs to be used.
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