Fix ESP8266 Device Group exception due to lack of stack space (#22271)

CHANGELOG.md

@@ -41,6 +41,7 @@ All notable changes to this project will be documented in this file.
 - ESP32-C2 TasmotaLED from not present I2S to SPI (#22575)
 - KNX Scenes index change regression from v14.2.0.4 (#22405)
 - Add GUI submenu headers and refresh configuration button text (#22592)
+- ESP8266 Device Group exception due to lack of stack space (#22271)
 
 ### Removed
 

RELEASENOTES.md

@@ -36,9 +36,9 @@ While fallback or downgrading is common practice it was never supported due to S
 
 This release will be supported from ESP8266/Arduino library Core version **2.7.8** due to reported security and stability issues on previous Core version. This will also support gzipped binaries.
 
-This release will be supported from ESP32/Arduino library Core version **v3.1.0.240926**.
+This release will be supported from ESP32/Arduino library Core version **v3.1.0.241206**.
 
-Support of ESP8266 Core versions before 2.7.8 and ESP32 Core versions before v3.1.0.240926 have been removed.
+Support of ESP8266 Core versions before 2.7.8 and ESP32 Core versions before v3.1.0.241206 have been removed.
 
 ## Support of TLS
 
@@ -80,7 +80,7 @@ Historical binaries can be downloaded from
 The latter links can be used for OTA upgrades too like ``OtaUrl http://ota.tasmota.com/tasmota/release/tasmota.bin.gz``
 
 ### ESP32, ESP32-C2, ESP32-C3, ESP32-C6, ESP32-S2 and ESP32-S3 based
-The following binary downloads have been compiled with ESP32/Arduino library core version **v3.1.0.240926**.
+The following binary downloads have been compiled with ESP32/Arduino library core version **v3.1.0.241206**.
 
 - **tasmota32.bin** = The Tasmota version with most drivers including additional sensors and KNX for 4M+ flash.  **RECOMMENDED RELEASE BINARY**
 - **tasmota32solo1.bin** = The Tasmota version with most drivers including additional sensors and KNX for single core ESP32 and 4M+ flash.
@@ -188,6 +188,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 - Mitsubishi Electric HVAC Standby Stage for MiElHVAC [#22430](https://github.com/arendst/Tasmota/issues/22430)
 - EQ3 TRV firmware version 1.46 fails if the default true is used in subscribe on the notify characteristic [#22328](https://github.com/arendst/Tasmota/issues/22328)
 - Ethernet on -DFRAMEWORK_ARDUINO_ITEAD framework regression from v14.3.0 [#22367](https://github.com/arendst/Tasmota/issues/22367)
+- ESP8266 Device Group exception due to lack of stack space (#22271)[#22271](https://github.com/arendst/Tasmota/issues/22271)
 - ESP32 Upgrade by file upload response based on file size [#22500](https://github.com/arendst/Tasmota/issues/22500)
 - ESP32 Arduino Core IPv6 zones used by Matter [#22378](https://github.com/arendst/Tasmota/issues/22378)
 - ESP32, ESP32-S2 and ESP32-S3 re-enable touch buttons [#22446](https://github.com/arendst/Tasmota/issues/22446)

tasmota/tasmota_support/support.ino

@@ -2654,11 +2654,12 @@ void AddLogData(uint32_t loglevel, const char* log_data, const char* log_data_pa
     // Each entry has this format: [index][loglevel][log data]['\1']
 
     // Truncate log messages longer than MAX_LOGSZ which is the log buffer size minus 64 spare
+    char *too_long = nullptr;
     uint32_t log_data_len = strlen(log_data) + strlen(log_data_payload) + strlen(log_data_retained);
-    char too_long[TOPSZ];
     if (log_data_len > MAX_LOGSZ) {
-      snprintf_P(too_long, sizeof(too_long) - 20, PSTR("%s%s"), log_data, log_data_payload);   // 20 = strlen("... 123456 truncated")
+      too_long = (char*)malloc(TOPSZ);     // Use heap in favour of stack
-      snprintf_P(too_long, sizeof(too_long), PSTR("%s... %d truncated"), too_long, log_data_len);
+      snprintf_P(too_long, TOPSZ - 20, PSTR("%s%s"), log_data, log_data_payload);   // 20 = strlen("... 123456 truncated")
+      snprintf_P(too_long, TOPSZ, PSTR("%s... %d truncated"), too_long, log_data_len);
       log_data = too_long;
       log_data_payload = empty;
       log_data_retained = empty;
@@ -2679,6 +2680,9 @@ void AddLogData(uint32_t loglevel, const char* log_data, const char* log_data_pa
     }
     snprintf_P(TasmotaGlobal.log_buffer, LOG_BUFFER_SIZE, PSTR("%s%c%c%s%s%s%s\1"),
       TasmotaGlobal.log_buffer, TasmotaGlobal.log_buffer_pointer++, '0'+loglevel, mxtime, log_data, log_data_payload, log_data_retained);
+    if (too_long) {
+      free(too_long);
+    }
     TasmotaGlobal.log_buffer_pointer &= 0xFF;
     if (!TasmotaGlobal.log_buffer_pointer) {
       TasmotaGlobal.log_buffer_pointer++;  // Index 0 is not allowed as it is the end of char string

tasmota/tasmota_support/support_command.ino

@@ -348,6 +348,13 @@ void ExecuteCommand(const char *cmnd, uint32_t source)
   CommandHandler(stopic, svalue, strlen(svalue));
 }
 
+bool GetFallbackTopicFlag(char* topicBuf) {
+  // Use this function to free CommandHandler stack space from TOPSZ
+  char stemp1[TOPSZ];
+  GetFallbackTopic_P(stemp1, "");        // Full Fallback topic = cmnd/DVES_xxxxxxxx_fb/
+  return (!strncmp(topicBuf, stemp1, strlen(stemp1)));
+}
+
 /********************************************************************************************/
 
 // topicBuf:                    /power1  dataBuf: toggle  = Console command
@@ -369,9 +376,7 @@ void CommandHandler(char* topicBuf, char* dataBuf, uint32_t data_len) {
     }
   }
 
-  char stemp1[TOPSZ];
+  TasmotaGlobal.fallback_topic_flag = GetFallbackTopicFlag(topicBuf);
-  GetFallbackTopic_P(stemp1, "");        // Full Fallback topic = cmnd/DVES_xxxxxxxx_fb/
-  TasmotaGlobal.fallback_topic_flag = (!strncmp(topicBuf, stemp1, strlen(stemp1)));
 
   char *type = strrchr(topicBuf, '/');   // Last part of received topic is always the command (type)
 
@@ -416,11 +421,13 @@ void CommandHandler(char* topicBuf, char* dataBuf, uint32_t data_len) {
   }
 
   Response_P(PSTR("_1"));  // Signal error message for either Command Error or Command Unknown
-  char number[12];
+  char stemp1[16];
-  char command_line[64];
+//  char command_line[64];
-  snprintf_P(command_line, sizeof(command_line), PSTR("%s%s%s%s"), 
+//  snprintf_P(command_line, sizeof(command_line), PSTR("%s%s%s%s"), 
+  char *command_line = (char*)malloc(64);  // Use heap in favour of stack
+  snprintf_P(command_line, 64, PSTR("%s%s%s%s"), 
     type,
-    (index != 1) ? itoa(index, number, 10) : "",
+    (index != 1) ? itoa(index, stemp1, 10) : "",
     (data_len) ? " " : "",
     (data_len) ? (binary_data) ? HexToString((uint8_t*)dataBuf, data_len).c_str() : EscapeJSONString(dataBuf).c_str() : "");
 
@@ -483,6 +490,7 @@ void CommandHandler(char* topicBuf, char* dataBuf, uint32_t data_len) {
     }
     ResponseAppend_P(PSTR(",\"Input\":\"%s\"}"), command_line);
   }
+  free(command_line);
 
   if (ResponseLength()) {
     if (TasmotaGlobal.no_mqtt_response){  // If it is activated, Tasmota will not publish MQTT messages, but it will proccess event trigger rules

tasmota/tasmota_xdrv_driver/xdrv_02_9_mqtt.ino

@@ -566,7 +566,8 @@ bool MqttPublishLib(const char* topic, const uint8_t* payload, unsigned int plen
 
   MqttClient.endPublish();
 
-  yield();  // #3313
+//  yield();  // #3313
+  delay(0);
   return true;
 }