diff --git a/common/include/log_line_entry.h b/common/include/log_line_entry.h
new file mode 100644
index 0000000..8f8da18
--- /dev/null
+++ b/common/include/log_line_entry.h
@@ -0,0 +1,69 @@
+#ifndef LOG_LINE_ENTRY_H_INCLUDED
+#define LOG_LINE_ENTRY_H_INCLUDED
+
+#include <cstring>
+#include <algorithm>
+
+struct LogLineEntry {
+    char receiver;      // 1    receiver can be: ISMAS
+    char reason[5];     // 6    SW_UP
+    char timestamp[19]; // 25   ISO-format: 1900-xx-xxT00:00:00
+    char eventId;       // 26
+    char event[5];      // 31
+    /*
+        Note:
+        ! After U0002 immer ein CMD_SENDVERSION
+        ! Only U0002 and U0003 finish the Update process.
+        ! U0001: Update finished but not activated
+        ! U0002: Update finished and activated
+        ! U0003: Update finished but FAILed.
+    */
+
+    // #define _ISMAS_DONE                 "U0001" // 100%, Check: Resultcode: 0
+    // #define _ISMAS_SET_WAIT_OK          "U0002" // empty WAIT-button (""), ResultCode: 0
+    // #define _ISMAS_NO_UPDATE_NECESSARY  "M0100" // empty WAIT-button (""), ResultCode: 0
+    // #define _ISMAS_FAILURE              "U0003" // FAIL
+    // #define _ISMAS_CONTINUE             "U0010" // %-values: Update laeuft, Resultcodes entsprechend laufender Schritt
+    // #define _ISMAS_RESET_WAIT           "ISMAS" // reset WAIT-button to "WAIT"
+    // #define _ISMAS_TEST_TRIGGER         "U0099" // check the WAIT-button
+    char eventState;    // 32
+    char percent;       // 33   percent in progressbar of update-tool
+    char resultCode;    // 34
+    char step[40];      // 74   step executed
+    char stepResult[40];// 114  result for step
+    char version[13];   // 127
+    char dummy;         // 128
+};
+
+inline static LogLineEntry initLogLineEntry(
+    char const receiver,
+    char const timestamp[19],
+    char const event[5],
+    char const eventState,
+    char const percent,
+    char const resultCode,
+    char const step[40],
+    char const stepResult[40],
+    char const eventId = 0,
+    char const reason[5] = "SW_UP",
+    char const version[14] = "") {
+    LogLineEntry e;
+    memset(&e, 0, sizeof(e));
+
+    e.receiver = receiver;
+    std::memcpy(e.reason, reason, std::min(sizeof(e.reason), strlen(reason)));
+    std::memcpy(e.timestamp, timestamp, std::min(sizeof(e.timestamp), strlen(timestamp)));
+    e.eventId = eventId;
+    std::memcpy(e.event, event, std::min(sizeof(e.event), strlen(event)));
+    e.eventState = eventState;
+    e.percent = percent;
+    e.resultCode = resultCode;
+    std::memcpy(e.step, step, std::min(sizeof(e.step), strlen(step)));
+    std::memcpy(e.stepResult, stepResult, std::min(sizeof(e.stepResult), strlen(stepResult)));
+    std::memcpy(e.version, version, std::min(sizeof(e.version), strlen(version)));
+    e.dummy = '\0';
+
+    return e;
+}
+
+#endif // LOG_LINE_ENTRY_H_INCLUDED