diff --git a/Cargo.lock b/Cargo.lock
index 4dc4e59f..d00fe227 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -242,12 +242,13 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-queue"
-version = "0.2.1"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c695eeca1e7173472a32221542ae469b3e9aac3a4fc81f7696bcad82029493db"
+checksum = "774ba60a54c213d409d5353bda12d49cd68d14e45036a285234c8d6f91f92570"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
+ "maybe-uninit",
 ]
 
 [[package]]
@@ -273,9 +274,9 @@ dependencies = [
 
 [[package]]
 name = "ctor"
-version = "0.1.14"
+version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf6b25ee9ac1995c54d7adb2eff8cfffb7260bc774fb63c601ec65467f43cd9d"
+checksum = "39858aa5bac06462d4dd4b9164848eb81ffc4aa5c479746393598fd193afa227"
 dependencies = [
  "quote",
  "syn",
@@ -479,9 +480,9 @@ checksum = "25a2bc672d1148e28034f176e01fffebb08b35768468cc954630da77a1449005"
 
 [[package]]
 name = "indexmap"
-version = "1.3.2"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "076f042c5b7b98f31d205f1249267e12a6518c1481e9dae9764af19b707d2292"
+checksum = "c398b2b113b55809ceb9ee3e753fcbac793f1956663f3c36549c1346015c2afe"
 dependencies = [
  "autocfg",
  "serde",
@@ -706,9 +707,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1502d12e458c49a4c9cbff560d0fe0060c252bc29799ed94ca2ed4bb665a0101"
+checksum = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
 dependencies = [
  "unicode-xid",
 ]
@@ -726,9 +727,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.6"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54a21852a652ad6f610c9510194f398ff6f8692e334fd1145fed931f7fbe44ea"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
 dependencies = [
  "proc-macro2",
 ]
@@ -791,9 +792,9 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed3d612bc64430efeb3f7ee6ef26d590dce0c43249217bddc62112540c7941e1"
+checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
 
 [[package]]
 name = "scopeguard"
@@ -837,9 +838,9 @@ dependencies = [
 
 [[package]]
 name = "serde_bytes"
-version = "0.11.4"
+version = "0.11.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bf487fbf5c6239d7ea2ff8b10cb6b811cd4b5080d1c2aeed1dec18753c06e10"
+checksum = "16ae07dd2f88a366f15bd0632ba725227018c69a1c8550a927324f8eb8368bb9"
 dependencies = [
  "serde",
 ]
@@ -857,9 +858,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.53"
+version = "1.0.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "993948e75b189211a9b31a7528f950c6adc21f9720b6438ff80a7fa2f864cea2"
+checksum = "ec2c5d7e739bc07a3e73381a39d61fdb5f671c60c1df26a130690665803d8226"
 dependencies = [
  "itoa",
  "ryu",
@@ -892,9 +893,9 @@ checksum = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
 
 [[package]]
 name = "syn"
-version = "1.0.27"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef781e621ee763a2a40721a8861ec519cb76966aee03bb5d00adb6a31dc1c1de"
+checksum = "b5304cfdf27365b7585c25d4af91b35016ed21ef88f17ced89c7093b43dba8b6"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -903,9 +904,9 @@ dependencies = [
 
 [[package]]
 name = "synstructure"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
+checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -975,9 +976,9 @@ checksum = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
 
 [[package]]
 name = "typetag"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ebb2c484029d695fb68a06d80e1536c68d491b3e0cf874c66abed255e831cfe"
+checksum = "9275125decb5d75fe57ebfe92debd119b15757aae27c56d7cb61ecab871960bc"
 dependencies = [
  "erased-serde",
  "inventory",
@@ -988,9 +989,9 @@ dependencies = [
 
 [[package]]
 name = "typetag-impl"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b63fd4799e4d0ec5cf0b055ebb8e2c3a657bbf76a84f6edc77ca60780e000204"
+checksum = "dc232cda3b1d82664153e6c95d1071809aa0f1011f306c3d6989f33d8c6ede17"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1128,7 +1129,7 @@ dependencies = [
 [[package]]
 name = "wasmer-interface-types"
 version = "0.17.0"
-source = "git+https://github.com/fluencelabs/interface-types#c2f2a23c38af049bce7a3e93a51ff287b3898410"
+source = "git+https://github.com/fluencelabs/interface-types#82986d10358f02c8ae64850ed0b79efb4e823c54"
 dependencies = [
  "nom",
  "serde",
diff --git a/examples/ipfs_node/src/errors.rs b/examples/ipfs_node/src/errors.rs
index 8b14db9c..398797e6 100644
--- a/examples/ipfs_node/src/errors.rs
+++ b/examples/ipfs_node/src/errors.rs
@@ -24,7 +24,7 @@ pub enum NodeError {
     /// An error related to config parsing.
     ConfigParseError(String),
 
-    /// Various errors related to file io.
+    /// Various errors related to file i/o.
     IOError(String),
 
     /// WIT doesn't contain such type.
diff --git a/examples/ipfs_node/src/lib.rs b/examples/ipfs_node/src/lib.rs
index 353ea2c7..f951f12b 100644
--- a/examples/ipfs_node/src/lib.rs
+++ b/examples/ipfs_node/src/lib.rs
@@ -20,6 +20,8 @@ mod config;
 mod imports;
 mod node_public_interface;
 
+pub use fce::IValue;
+
 pub use node::IpfsNode;
 pub use node_public_interface::NodePublicInterface;
 pub use node_public_interface::NodeModulePublicInterface;
diff --git a/examples/ipfs_node/wasm/ipfs_node/Cargo.toml b/examples/ipfs_node/wasm/ipfs_node/Cargo.toml
index 11b12371..3fea3b4c 100644
--- a/examples/ipfs_node/wasm/ipfs_node/Cargo.toml
+++ b/examples/ipfs_node/wasm/ipfs_node/Cargo.toml
@@ -4,7 +4,6 @@ version = "0.1.0"
 authors = ["Fluence Labs"]
 edition = "2018"
 
-[lib]
+[[bin]]
 name = "wasm_ipfs_node"
-path = "src/lib.rs"
-crate-type = ["cdylib"]
+path = "src/main.rs"
diff --git a/examples/ipfs_node/wasm/ipfs_node/src/lib.rs b/examples/ipfs_node/wasm/ipfs_node/src/main.rs
similarity index 82%
rename from examples/ipfs_node/wasm/ipfs_node/src/lib.rs
rename to examples/ipfs_node/wasm/ipfs_node/src/main.rs
index d7af2cee..554a998c 100644
--- a/examples/ipfs_node/wasm/ipfs_node/src/lib.rs
+++ b/examples/ipfs_node/wasm/ipfs_node/src/main.rs
@@ -23,12 +23,15 @@ use crate::result::{RESULT_PTR, RESULT_SIZE};
 
 const RESULT_PATH: &str = "/tmp/ipfs_rpc_file";
 
+pub fn main() {
+    println!("ipfs_node.main: WASI initialization finished");
+}
+
 #[no_mangle]
 pub unsafe fn put(file_path_ptr: *mut u8, file_path_size: usize) {
     let file_path = String::from_raw_parts(file_path_ptr, file_path_size, file_path_size);
 
-    let msg = format!("ipfs_node.put: file path is {}\n", file_path);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_node.put: file path is {}\n", file_path);
 
     let cmd = format!("add -Q {}", file_path);
     let result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
@@ -43,8 +46,7 @@ pub unsafe fn put(file_path_ptr: *mut u8, file_path_size: usize) {
         "host ipfs call failed".to_string()
     };
 
-    let msg = format!("ipfs_node.put: file add wtih hash is {} \n", hash);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_node.put: file add wtih hash is {} \n", hash);
 
     *RESULT_PTR.get_mut() = hash.as_ptr() as _;
     *RESULT_SIZE.get_mut() = hash.len();
@@ -55,8 +57,7 @@ pub unsafe fn put(file_path_ptr: *mut u8, file_path_size: usize) {
 pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
     let hash = String::from_raw_parts(hash_ptr, hash_size, hash_size);
 
-    let msg = format!("ipfs_node.get: file hash is {}\n", hash);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_node.get: file hash is {}\n", hash);
 
     let cmd = format!("get -o {}  {}", RESULT_PATH, hash);
     let _result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
@@ -70,8 +71,7 @@ pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
     // TODO: check output
 
     let file_path = RESULT_PATH.to_string();
-    let msg = format!("ipfs_node.get: file path is {}", file_path);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_node.get: file path is {}", file_path);
 
     *RESULT_PTR.get_mut() = file_path.as_ptr() as _;
     *RESULT_SIZE.get_mut() = file_path.len();
diff --git a/examples/ipfs_node/wasm/ipfs_rpc/Cargo.toml b/examples/ipfs_node/wasm/ipfs_rpc/Cargo.toml
index 37e2bc95..8755eb6c 100644
--- a/examples/ipfs_node/wasm/ipfs_rpc/Cargo.toml
+++ b/examples/ipfs_node/wasm/ipfs_rpc/Cargo.toml
@@ -4,7 +4,6 @@ version = "0.1.0"
 authors = ["Fluence Labs"]
 edition = "2018"
 
-[lib]
+[[bin]]
 name = "wasm_ipfs_rpc"
-path = "src/lib.rs"
-crate-type = ["cdylib"]
+path = "src/main.rs"
diff --git a/examples/ipfs_node/wasm/ipfs_rpc/src/lib.rs b/examples/ipfs_node/wasm/ipfs_rpc/src/main.rs
similarity index 75%
rename from examples/ipfs_node/wasm/ipfs_rpc/src/lib.rs
rename to examples/ipfs_node/wasm/ipfs_rpc/src/main.rs
index 83b366c5..0e55c83f 100644
--- a/examples/ipfs_node/wasm/ipfs_rpc/src/lib.rs
+++ b/examples/ipfs_node/wasm/ipfs_rpc/src/main.rs
@@ -22,13 +22,17 @@ use crate::result::{RESULT_PTR, RESULT_SIZE};
 use std::fs;
 use std::path::PathBuf;
 
+const RPC_TMP_FILEPATH: &str = "/tmp/ipfs_rpc_file";
+
+pub fn main() {
+    println!("ipfs_rpc.main: WASI initialization finished");
+}
+
 #[no_mangle]
 pub unsafe fn invoke(_ptr: *mut u8, _size: usize) {
-    let msg = "ipfs_rpc.invoke: invoke called";
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
-
-    let result = "IFPFS_RPC wasm example, it allow:\nput\nget".to_string();
+    println!("ipfs_rpc.invoke: invoke called");
 
+    let result = "IPFS_RPC wasm example, it allow:\nput\nget".to_string();
     *RESULT_PTR.get_mut() = result.as_ptr() as _;
     *RESULT_SIZE.get_mut() = result.len();
     std::mem::forget(result);
@@ -39,15 +43,13 @@ pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
     let file_content =
         String::from_raw_parts(file_content_ptr, file_content_size, file_content_size);
 
-    let msg = format!("ipfs_rpc.put: file_content is {}\n", file_content);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_rpc.put: file_content is {}\n", file_content);
 
-    let rpc_tmp_filepath = "/tmp/ipfs_rpc.tmp".to_string();
+    let rpc_tmp_filepath = RPC_TMP_FILEPATH.to_string();
 
     let r = fs::write(PathBuf::from(rpc_tmp_filepath.clone()), file_content);
     if let Err(e) = r {
-        let msg: String = e.to_string();
-        log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+        println!("{}", e);
     }
 
     ipfs_put(rpc_tmp_filepath.as_ptr() as _, rpc_tmp_filepath.len() as _);
@@ -59,8 +61,7 @@ pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
         *RESULT_SIZE.get_mut(),
     );
 
-    let msg = format!("ipfs_rpc.put: file add with hash {}\n", hash);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_rpc.put: file add with hash {}\n", hash);
 
     *RESULT_PTR.get_mut() = hash.as_ptr() as _;
     *RESULT_SIZE.get_mut() = hash.len();
@@ -71,8 +72,7 @@ pub unsafe fn put(file_content_ptr: *mut u8, file_content_size: usize) {
 pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
     let hash = String::from_raw_parts(hash_ptr, hash_size, hash_size);
 
-    let msg = format!("ipfs_rpc.get: getting file with hash {}\n", hash);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_rpc.get: getting file with hash {}\n", hash);
 
     ipfs_get(hash.as_ptr() as _, hash.len() as _);
 
@@ -82,8 +82,7 @@ pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
         *RESULT_SIZE.get_mut(),
     );
 
-    let msg = format!("ipfs_rpc.get: reading file from {}\n", file_path);
-    log_utf8_string(msg.as_ptr() as _, msg.len() as _);
+    println!("ipfs_rpc.get: reading file from {}\n", file_path);
 
     let file_content = fs::read(file_path).unwrap_or_else(|_| b"error while reading file".to_vec());
 
diff --git a/fce/src/vm/module/fce_module.rs b/fce/src/vm/module/fce_module.rs
index 0ccf4c86..7261e12a 100644
--- a/fce/src/vm/module/fce_module.rs
+++ b/fce/src/vm/module/fce_module.rs
@@ -81,6 +81,8 @@ impl FCEModule {
         mut fce_imports: ImportObject,
         modules: &HashMap<String, FCEModule>,
     ) -> Result<Self, FCEError> {
+        use wasmer_runtime::Func;
+
         let wasmer_module = compile(&wasm_bytes)?;
         let wit = extract_wit(&wasmer_module)?;
         let fce_wit = FCEWITInterfaces::new(wit);
@@ -100,6 +102,10 @@ impl FCEModule {
 
         let exports_funcs = Self::instantiate_wit_exports(wit_instance, &fce_wit)?;
 
+        if let Ok(start_func) = wasmer_instance.exports.get::<Func<'_, (), ()>>("_start") {
+            start_func.call()?;
+        }
+
         Ok(Self {
             wamser_instance: Box::new(wasmer_instance),
             import_object,