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esp_http_server: support dynamic payload len for ws server

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Closes https://github.com/espressif/esp-idf/issues/6433
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yuanjm
2021-02-02 15:00:01 +08:00
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parent 56ca89f0f5
commit cd521d4ae3
7 changed files with 131 additions and 56 deletions
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15
examples/protocols/https_server/wss_server/README.md
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@@ -8,6 +8,21 @@ See the `esp_https_server` component documentation for details.
Before using the example, open the project configuration menu (`idf.py menuconfig`) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../../README.md) for more details.
`httpd_ws_recv_frame` support two ways to get frame payload.
* Static buffer -- Allocate maximum expected packet length (either statically or dynamically) and call `httpd_ws_recv_frame()` referencing this buffer and it's size. (Unnecessarily large buffers might cause memory waste)
```
#define MAX_PAYLOAD_LEN 128
uint8_t buf[MAX_PAYLOAD_LEN] = { 0 };
httpd_ws_frame_t ws_pkt;
ws_pkt.payload = buf;
httpd_ws_recv_frame(req, &ws_pkt, MAX_PAYLOAD_LEN);
```
* Dynamic buffer -- Refer to the examples, which receive websocket data in these three steps:
1) Call `httpd_ws_recv_frame()` with zero buffer size
2) Allocate the size based on the received packet length
3) Call `httpd_ws_recv_frame()` with the allocated buffer
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