Use a more sane default MTU, have features to change MTU (esp-rs#164)

Author: bjoernQ

esp-wifi/Cargo.toml

@@ -35,7 +35,7 @@ embassy-net = { workspace = true, optional = true }
 embassy-net-driver = { workspace = true, optional = true }
 
 [features]
-default = [ "utils" ]
+default = [ "utils", "mtu-1492" ]
 
 # chip features
 esp32c3 = [ "esp32c3-hal", "dep:esp32c3", "esp-wifi-sys/esp32c3", "esp-hal-common/esp32c3" ]
@@ -67,3 +67,7 @@ phy-enable-usb = []
 ps-min-modem = []
 esp-now = [ "wifi", "embedded-svc" ]
 big-heap = []
+mtu-1514 = []
+mtu-1500 = []
+mtu-1492 = []
+mtu-746 = []

esp-wifi/src/lib.rs

@@ -95,13 +95,13 @@ const HEAP_SIZE: usize = 64 * 1024;
 const HEAP_SIZE: usize = 64 * 1024;
 
 #[cfg(all(not(coex), not(feature = "esp32s2"), feature = "big-heap"))]
-const HEAP_SIZE: usize = 92 * 1024;
+const HEAP_SIZE: usize = 110 * 1024;
 
 #[cfg(all(not(coex), feature = "esp32s2", feature = "big-heap"))]
 const HEAP_SIZE: usize = 72 * 1024;
 
 #[cfg(all(coex, feature = "big-heap"))]
-const HEAP_SIZE: usize = 100 * 1024;
+const HEAP_SIZE: usize = 110 * 1024;
 
 #[cfg_attr(feature = "esp32", link_section = ".dram2_uninit")]
 static mut HEAP_DATA: [MaybeUninit<u8>; HEAP_SIZE] = [MaybeUninit::uninit(); HEAP_SIZE];

esp-wifi/src/wifi/mod.rs

@@ -15,6 +15,7 @@ use esp_hal_common::peripheral::PeripheralRef;
 use esp_wifi_sys::include::esp_interface_t_ESP_IF_WIFI_AP;
 use esp_wifi_sys::include::esp_wifi_disconnect;
 use esp_wifi_sys::include::esp_wifi_get_mode;
+use esp_wifi_sys::include::esp_wifi_set_protocol;
 use esp_wifi_sys::include::wifi_ap_config_t;
 use esp_wifi_sys::include::wifi_auth_mode_t_WIFI_AUTH_WAPI_PSK;
 use esp_wifi_sys::include::wifi_auth_mode_t_WIFI_AUTH_WEP;
@@ -29,14 +30,22 @@ use esp_wifi_sys::include::wifi_interface_t_WIFI_IF_AP;
 use esp_wifi_sys::include::wifi_mode_t_WIFI_MODE_AP;
 use esp_wifi_sys::include::wifi_mode_t_WIFI_MODE_APSTA;
 use esp_wifi_sys::include::wifi_mode_t_WIFI_MODE_NULL;
-use esp_wifi_sys::include::esp_wifi_set_protocol;
 use num_derive::FromPrimitive;
 use num_traits::FromPrimitive;
 
 #[doc(hidden)]
 pub use os_adapter::*;
 use smoltcp::phy::{Device, DeviceCapabilities, RxToken, TxToken};
 
+#[cfg(feature = "mtu-1514")]
+const MTU: usize = 1514;
+#[cfg(feature = "mtu-1500")]
+const MTU: usize = 1500;
+#[cfg(feature = "mtu-1492")]
+const MTU: usize = 1492;
+#[cfg(feature = "mtu-746")]
+const MTU: usize = 746;
+
 #[cfg(feature = "esp32")]
 use esp32_hal as hal;
 #[cfg(feature = "esp32c2")]
@@ -938,7 +947,7 @@ impl<'d> Device for WifiDevice<'d> {
 
     fn capabilities(&self) -> smoltcp::phy::DeviceCapabilities {
         let mut caps = DeviceCapabilities::default();
-        caps.max_transmission_unit = 1514;
+        caps.max_transmission_unit = MTU;
         caps.max_burst_size = Some(1);
         caps
     }
@@ -1397,7 +1406,7 @@ pub(crate) mod embassy {
 
         fn capabilities(&self) -> Capabilities {
             let mut caps = Capabilities::default();
-            caps.max_transmission_unit = 1514;
+            caps.max_transmission_unit = MTU;
             caps.max_burst_size = Some(1);
             caps
         }