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liblxi v1.20
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@lundmar lundmar released this 20 May 10:21
· 16 commits to master since this release
v1.20
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lundmar Martin Lund
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Changes since liblxi v1.19:

Rob Carruthers:

  • refactor(bonjour): Fix typo & Refine browse default domain

  • feat(bonjour): Add mdns support for macOS

    This code is designed to discover LXI (LAN eXtensions for Instrumentation) devices using the Bonjour service (dns_sd.h) discovery protocol. The flow of the implementation is as follows:

    1. bonjour_discover(lxi_info_t *info, int timeout_ms) is the entry point of the code. It takes an lxi_info_t struct to store the discovered information and a timeout in milliseconds. It calls the browse_lxi_services() function with these parameters. The lxi_info_t is setup with callbacks to initially to recieve the discovered instrument data. See test folder for examples.

    2. lxi_info_t struct is defined in lxi.h.
      browse_lxi_services(lxi_info_t *info, int timeout_ms) iterates through lxi_services (defined in lxi.h) and calls the Bonjour DNSServiceBrowse() function for each service. It then processes the results and sets a timeout to stop waiting for results after a specified duration. It provides the browse_call back() function as a callback.

    3. browse_callback() is called for each discovered service. It extracts relevant information about the service and then creates a browse_data_t struct to aggregate service data. It calls DNSServiceResolve() to resolve the service's hostname, and provides resolve_callback() as a callback.

    4. resolve_callback() is called once the service hostname is resolved. It calls the resolve_ip_address() function to convert the hostname into an IP address. It also extracts more information about the service and then calls the info->service() callback function with the discovered service's information. Finally, it frees the memory allocated for the browse_data_t struct.

    5. resolve_ip_address() takes a hostname and port, and converts them into an IP address using the getaddrinfo() function. The resulting IP address is stored in the provided buffer.

    Service types and labels are declared in the lxi_services array in src/lxc.c

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