diff --git a/.gitmodules b/.gitmodules
index b3dbd1c..e69de29 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +0,0 @@
-[submodule "Sources/DataAcquisition"]
-	path = Sources/DataAcquisition
-	url = https://repositories.communitynotfound.work/PoliBa-Software-Architecture/embeddedLibrary.git
diff --git a/Sources/IoT-Simulator-Core/Classes/Utils/Field.swift b/Sources/IoT-Simulator-Core/Classes/Utils/Field.swift
index ece961a..5396a4c 100644
--- a/Sources/IoT-Simulator-Core/Classes/Utils/Field.swift
+++ b/Sources/IoT-Simulator-Core/Classes/Utils/Field.swift
@@ -1,5 +1,5 @@
 
-public class Field {
+public class Field : Codable{
 
     public let key: String
     public let value: String
diff --git a/Sources/IoT-Simulator-Core/Utils/MessageBytes.md b/Sources/IoT-Simulator-Core/Utils/MessageBytes.md
new file mode 100644
index 0000000..1849108
--- /dev/null
+++ b/Sources/IoT-Simulator-Core/Utils/MessageBytes.md
@@ -0,0 +1,54 @@
+# Message Structure
+```
++-- 64 - bits---+----------------+-------------+----------------+-----------------------+
+| Version 8     | Message Type 8 | Dev Type 8  | RESERVED 8     | Sign Type 32          |
++---------------+----------------+-------------+----------------+-----------------------+
+| Timestamp 64                                                                          |
++---------------------------------------------------------------------------------------+
+| DevID 128 bits                                                                        |
+|                                                                                       |
++---------------------------------------------------------------------------------------+
+| Location 192 bits                                                                     |
+|                                                                                       |
+|                                                                                       |
++---------------------------------------------------------------------------------------+
+\                                                                                       /
+ | Fields -----------------------------------------------------------------------------|
+/                                                                                       \
++---------------------------------------------------------------------------------------+
+| 0 Padding 64 - n                                                                      |
++---------------------------------------------------------------------------------------+
+| 0 FIELD STOP 64                                                                       |
++---------------------------------------------------------------------------------------+
+| Signature up to-512 bits                                                              |
+|                                                                                       |
+|                                                                                       |
+|                                                                                       |
+|                                                                                       |
+|                                                                                       |
+|                                                                                       |
+|                                                                                       |
++---------------------------------------------------------------------------------------+
+```
+
+# Fields
+each field can be at most 8 * 2^32 bits of length:
+- 34359738368 bits
+- 4294967296 Bytes
+
+## Key
+**MUST** be a `String`
+
+## Value
+It's up to the Application to decide whether the value is 
+a string or another type of datum
+
+```
++-- 64 - bits--------------------------+----------------------------------------+
+|  Key-Length 32                       | Value-Length 32                        |
++--------------------------------------+----------------------------------------+
+\   Key                                                                         /
+ |-----------------------------------------------------------------------------|
+/   Value                                                                       \
++-------------------------------------------------------------------------------+
+```
\ No newline at end of file
diff --git a/Sources/IoT-Simulator-Core/Utils/Security.swift b/Sources/IoT-Simulator-Core/Utils/Security.swift
index b84b4a6..a2000c9 100644
--- a/Sources/IoT-Simulator-Core/Utils/Security.swift
+++ b/Sources/IoT-Simulator-Core/Utils/Security.swift
@@ -2,6 +2,7 @@ import Crypto  // Equivalent to CryptoKit (more or less)
 import Foundation
 
 
+
 //  ------------------
 //  --- Sign ---------
 //  ------------------
diff --git a/Tests/IoT-Simulator-CoreTests/IoTCore-Tests.swift b/Tests/IoT-Simulator-CoreTests/IoTCore-Tests.swift
index 3206c5a..8d958a2 100644
--- a/Tests/IoT-Simulator-CoreTests/IoTCore-Tests.swift
+++ b/Tests/IoT-Simulator-CoreTests/IoTCore-Tests.swift
@@ -66,7 +66,7 @@ import Testing
 
 @Test func stressLoop1() async throws {
 
-    let devices: Int = 5000
+    let devices: Int = 1000
 
     let env = PhysicalEnvironment("Delta")
     let truth = PhysicalData(.Temperature, 22)