32 lines
1.6 KiB
C
32 lines
1.6 KiB
C
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#ifndef DOT11P_H
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#define DOT11P_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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// Wraps a GeoNetworking-layer payload in an 802.11 OCB frame: QoS Data
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// (subtype 8, 26-byte header), matching real ITS-G5 hardware, broadcast, no
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// BSS (Addr1=Addr3=broadcast), LLC/SNAP with Ethertype 0x8947
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// (GeoNetworking's registered Ethertype). Output is ready to hand straight
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// to esp_wifi_80211_tx_custom() (tx_custom.c) - NOT esp_wifi_80211_tx(),
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// which rejects this frame type outright. `src_mac` is used as Addr2 - pass
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// the same 6 bytes you gave geonet_wrap_shb, since GN_ADDR's MID field is
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// defined to be this same link-layer address. Returns bytes written, or -1
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// if out buffer too small.
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//
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// History: this used to be downgraded to non-QoS Data (subtype 0) because
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// esp_wifi_80211_tx() rejects QoS Data ("unsupport QoS frame type" / esp_err
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// 258) and an attempted linker-override bypass (old main/wifi_patches.c)
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// didn't work. Restored to QoS Data now that main.c transmits via
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// esp_wifi_80211_tx_custom() instead, which bypasses that gate entirely
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// (see tx_custom.c) - so there's no longer a reason to deviate from the
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// real frame format.
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// qos=true -> QoS Data (subtype 8, 26-byte header) for esp_wifi_80211_tx_custom()
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// qos=false -> plain Data (subtype 0, 24-byte header) which the STANDARD
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// esp_wifi_80211_tx() accepts (used for the standard-TX isolation test)
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int dot11p_build_frame(const uint8_t *gn_payload, int gn_len,
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const uint8_t src_mac[6],
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uint8_t *out, size_t out_len, bool qos);
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#endif
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