rpi net: networks scan and interrupt mode #885
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Besides blocking wifi join we can now poll for the join status while still have option to do another work between polls.
During join and later in recv. We can now detect disconnect, reconnect and set connected state.
Make them both return has more flag.
2 + len when len is u8 can overflow
Handle scan/join in the same function. Add join_state and scan_result to the main struct.
Fix todo: move country option to init. Rename methods, join and scan are no blocking returning poller. Blocking join is now join_wait.
Report status after init, not also during init. Remember last status and de-duplicate. Remove error log which is also passed to the application.
Use that state to set lwip link up/down.
Handling cyw43 data packet receive interrupts.
vtable is `*const Vtable` making it runtime known makes that local variable. Making it comptime known const.
Partially reverting changes from ZigEmbeddedGroup#861. Macros set on net module are not visible when building lwip. For example setting `net_mod.addCMacro("MEM_ALIGNMENT", "4");` gets lwip build with default 1 of MEM_ALIGNMENT. Changed to setting that on lwip module instead of net module. Later I also copied that to the net module because it is needed when using cImport in net package. Without that it also gets default if I check `lwip.MEM_ALIGNMENT` somewhere in src/root.zig.
Suggested by lint results.
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This adds few more features to the rpi pico WiFi driver:
There are two new examples:
scanlists available WiFi networksirqshows how to use interrupt mode, interrupt is fired when there is data packet to read from cyw43