diff --git a/firmware/Cargo.lock b/firmware/Cargo.lock
index 131130b..0175834 100644
--- a/firmware/Cargo.lock
+++ b/firmware/Cargo.lock
@@ -4,9 +4,15 @@ version = "0.1.0"
 dependencies = [
  "cortex-m 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "cortex-m-rt 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=6bc6cc7)",
  "tm4c129x 0.4.0 (git+https://github.com/m-labs/dslite2svd)",
 ]
 
+[[package]]
+name = "byteorder"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "cortex-m"
 version = "0.2.5"
@@ -29,11 +35,25 @@ name = "cortex-m-semihosting"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "managed"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "r0"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "smoltcp"
+version = "0.4.0-pre"
+source = "git+https://github.com/m-labs/smoltcp?rev=6bc6cc7#6bc6cc7af7ab7b710e9238b3c34bd50425ed7a92"
+dependencies = [
+ "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "managed 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tm4c129x"
 version = "0.4.0"
@@ -57,10 +77,13 @@ dependencies = [
 ]
 
 [metadata]
+"checksum byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d"
 "checksum cortex-m 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "56f002db38ab2c7a829bc0b997db8c5f47ada08f88a248c729d4f73c555628db"
 "checksum cortex-m-rt 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0db3cf185ad88e3d70e9b7738d1bad23f86322130d376df9b80a64df7abdb4cb"
 "checksum cortex-m-semihosting 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "54a88e8fd577808637f819107f34eece1b6b45be8db1c56d1c563095b80b655e"
+"checksum managed 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "61eb783b4fa77e8fa4d27ec400f97ed9168546b8b30341a120b7ba9cc6571aaf"
 "checksum r0 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6e7bbed8cd0a245bbf3759ebb35c964822b7a8c15ceeeee56d4cc5f060ce518e"
+"checksum smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=6bc6cc7)" = "<none>"
 "checksum tm4c129x 0.4.0 (git+https://github.com/m-labs/dslite2svd)" = "<none>"
 "checksum vcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "45c297f0afb6928cd08ab1ff9d95e99392595ea25ae1b5ecf822ff8764e57a0d"
 "checksum volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0d67cb4616d99b940db1d6bd28844ff97108b498a6ca850e5b6191a532063286"
diff --git a/firmware/Cargo.toml b/firmware/Cargo.toml
index 53412ac..d580734 100644
--- a/firmware/Cargo.toml
+++ b/firmware/Cargo.toml
@@ -8,6 +8,12 @@ cortex-m = "0.2.5"
 cortex-m-rt = { version = "0.2.0", features = ["linker-script"], default-features = false }
 tm4c129x = { git = "https://github.com/m-labs/dslite2svd" }
 
+[dependencies.smoltcp]
+git = "https://github.com/m-labs/smoltcp"
+rev = "6bc6cc7"
+features = []
+default-features = false
+
 [profile.release]
 lto = true
 debug = true
diff --git a/firmware/src/ethmac.rs b/firmware/src/ethmac.rs
index d3aca83..14685a4 100644
--- a/firmware/src/ethmac.rs
+++ b/firmware/src/ethmac.rs
@@ -353,7 +353,7 @@ impl Device for EthernetDevice {
         limits
     }
 
-    fn receive(&mut self) -> Result<Self::RxBuffer, Error> {
+    fn receive(&mut self, _timestamp: u64) -> Result<Self::RxBuffer, Error> {
         unsafe {
             if 0 == (EMAC_DATA.rx_desc_buf[EMAC_DATA.rx_cur_desc + 0] & EMAC_RDES0_OWN) {
                 // check for the whole packet in the buffer and no any error
@@ -375,7 +375,7 @@ impl Device for EthernetDevice {
         }
     }
 
-    fn transmit(&mut self, length: usize) -> Result<Self::TxBuffer, Error> {
+    fn transmit(&mut self, _timestamp: u64, length: usize) -> Result<Self::TxBuffer, Error> {
         unsafe {
             // Check if the TX DMA buffer released
             if 0 == (EMAC_DATA.tx_desc_buf[EMAC_DATA.tx_cur_desc + 0] & EMAC_TDES0_OWN) {
diff --git a/firmware/src/main.rs b/firmware/src/main.rs
index ea156d7..8dc35f6 100644
--- a/firmware/src/main.rs
+++ b/firmware/src/main.rs
@@ -4,6 +4,7 @@
 extern crate cortex_m;
 extern crate cortex_m_rt;
 extern crate tm4c129x;
+extern crate smoltcp;
 
 use core::cell::{Cell, RefCell};
 use core::fmt;
@@ -28,6 +29,7 @@ macro_rules! println {
 
 #[macro_use]
 mod board;
+mod ethmac;
 mod pid;
 mod loop_anode;
 mod loop_cathode;