Fix syslog server warning

Fix syslog server warning caused by lack of <PRI> field and hostname starting with 'z' (#14689)

CHANGELOG.md

@@ -19,6 +19,7 @@ All notable changes to this project will be documented in this file.
 - Matter Contact sensor was not triggering any update (#20232)
 - CVE-2021-36603 Cross Site Scripting (XSS) vulnerability (#12221)
 - ESP32 piezo ceramic buzzer doesn't buzz (#20118)
+- Syslog server warning caused by lack of <PRI> field and hostname starting with 'z' (#14689)
 
 ### Removed
 

RELEASENOTES.md

@@ -130,6 +130,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 
 ### Fixed
 - CVE-2021-36603 Cross Site Scripting (XSS) vulnerability [#12221](https://github.com/arendst/Tasmota/issues/12221)
+- Syslog server warning caused by lack of <PRI> field and hostname starting with 'z' [#14689](https://github.com/arendst/Tasmota/issues/14689)
 - ESP32 piezo ceramic buzzer doesn't buzz [#20118](https://github.com/arendst/Tasmota/issues/20118)
 - Matter Contact sensor was not triggering any update [#20232](https://github.com/arendst/Tasmota/issues/20232)
 

tasmota/tasmota_support/support.ino

@@ -2297,8 +2297,9 @@ void SyslogAsync(bool refresh) {
   char* line;
   size_t len;
   while (GetLog(TasmotaGlobal.syslog_level, &index, &line, &len)) {
-    // 00:00:02.096 HTP: Web server active on wemos5 with IP address 192.168.2.172
+    // <--- mxtime ---> TAG  MSG
-    //              HTP: Web server active on wemos5 with IP address 192.168.2.172
+    // 00:00:02.096-029 HTP: Web server active on wemos5 with IP address 192.168.2.172
+    //                  HTP: Web server active on wemos5 with IP address 192.168.2.172
     uint32_t mxtime = strchr(line, ' ') - line +1;  // Remove mxtime
     if (mxtime > 0) {
       uint32_t current_hash = GetHash(SettingsText(SET_SYSLOG_HOST), strlen(SettingsText(SET_SYSLOG_HOST)));
@@ -2321,7 +2322,14 @@ void SyslogAsync(bool refresh) {
       }
 
       char header[64];
-      snprintf_P(header, sizeof(header), PSTR("%s ESP-"), NetworkHostname());
+      // RFC3164 - BSD syslog protocol - <PRI>TIMESTAMP HOSTNAME TAG MSG
+      // <PRI> = Facility 16 (= local use 0), Severity 6 (= informational) => 16 * 8 + 6 = <134>
+      // TIMESTAMP = Mmm dd hh:mm:ss
+      // <134>Jan  1 00:00:02 wemos5 ESP-HTP: server active on wemos5 with IP address 192.168.2.172
+      snprintf_P(header, sizeof(header), PSTR("<134>%s %s ESP-"), GetSyslogDate(line).c_str(), NetworkHostname());
+      // Legacy format
+//      snprintf_P(header, sizeof(header), PSTR("%s ESP-"), NetworkHostname());
+
       char* line_start = line +mxtime;
 #ifdef ESP8266
       // Packets over 1460 bytes are not send

tasmota/tasmota_support/support_rtc.ino

@@ -109,6 +109,18 @@ String GetBuildDateAndTime(void) {
   return String(bdt);  // 2017-03-07T11:08:02
 }
 
+String GetSyslogDate(char* mxtime) {
+  // Mmm dd hh:mm:ss
+  // Jan  3 09:23:45
+  // Assuming the day hasn't changed yet ;-)
+  uint32_t month_idx = (RtcTime.month -1) * 3;
+  char month[4] = { 0 };
+  strncpy_P(month, kMonthNamesEnglish + month_idx, 3);
+  char dt[16];
+  snprintf_P(dt, sizeof(dt), PSTR("%s %2d %s"), month, RtcTime.day_of_month, mxtime);
+  return String(dt);
+}
+
 String GetMinuteTime(uint32_t minutes) {
   char tm[6];
   snprintf_P(tm, sizeof(tm), PSTR("%02d:%02d"), minutes / 60, minutes % 60);