feat: add rust demo

examples/tos_meets_rust/app/src/bridge.rs

@@ -0,0 +1,11 @@
+use cty::*;
+
+/// These glue functions are from tosglue.c
+extern {
+    pub fn rust_print(msg: *const u8);
+    pub fn rust_oled_print(msg: *const u8);
+    pub fn rust_wifi_init() -> i32;
+    pub fn rust_wifi_connect(ssid: *const u8, passwd: *const u8);
+    pub fn rust_sleep(ms: u32);
+    pub fn rust_mqtt_daemon() -> c_void;
+}

examples/tos_meets_rust/app/src/lib.rs

@@ -0,0 +1,23 @@
+#![no_std]
+
+extern crate cortex_m;
+
+mod bridge;
+
+use crate::bridge::*;
+use cty::*;
+
+#[no_mangle]
+pub extern "C" fn application_entry_rust() -> c_void {
+    unsafe {
+        rust_print(b"[+] Welcome to the RUST-WORLD in TencentOS :)".as_ptr());
+        rust_mqtt_daemon();
+    }
+
+    loop {
+        unsafe {
+            rust_print(b"[+] This is a mqtt demo!".as_ptr());
+            rust_sleep(5000u32);
+        }
+    }
+}