diff --git a/code/espurna/config/general.h b/code/espurna/config/general.h
index 01aa3e24..1ae81029 100644
--- a/code/espurna/config/general.h
+++ b/code/espurna/config/general.h
@@ -277,6 +277,7 @@ PROGMEM const char* const custom_reset_string[] = {
 #define RELAY_PROVIDER_DUAL     1
 #define RELAY_PROVIDER_LIGHT    2
 #define RELAY_PROVIDER_RFBRIDGE 3
+#define RELAY_PROVIDER_STM      4
 
 // Default boot mode: 0 means OFF, 1 ON and 2 whatever was before
 #define RELAY_BOOT_MODE         RELAY_BOOT_OFF
diff --git a/code/espurna/config/hardware.h b/code/espurna/config/hardware.h
index edbefa8c..68113df1 100644
--- a/code/espurna/config/hardware.h
+++ b/code/espurna/config/hardware.h
@@ -1394,6 +1394,20 @@
 
 // -----------------------------------------------------------------------------
 
+#elif defined(STM_RELAY)
+
+    // Info
+    #define MANUFACTURER            "STM_RELAY"
+    #define DEVICE                  "2CH"
+
+    // Relays
+    #define DUMMY_RELAY_COUNT       2
+    #define RELAY_PROVIDER          RELAY_PROVIDER_STM
+
+    // Remove UART noise on serial line
+    #define TERMINAL_SUPPORT        0
+    #define DEBUG_SERIAL_SUPPORT    0
+
 #endif
 
 // -----------------------------------------------------------------------------
diff --git a/code/espurna/relay.ino b/code/espurna/relay.ino
index 65544f91..11ced058 100644
--- a/code/espurna/relay.ino
+++ b/code/espurna/relay.ino
@@ -77,6 +77,15 @@ void _relayProviderStatus(unsigned char id, bool status) {
 
     #endif
 
+    #if RELAY_PROVIDER == RELAY_PROVIDER_STM
+        Serial.flush();
+        Serial.write(0xA0);
+        Serial.write(id + 1);
+        Serial.write(status);
+        Serial.write(0xA1 + status + id);
+        Serial.flush();
+    #endif
+
     #if RELAY_PROVIDER == RELAY_PROVIDER_LIGHT
 
         // If the number of relays matches the number of light channels
@@ -453,7 +462,11 @@ void _relayBoot() {
         }
         _relays[i].current_status = !status;
         _relays[i].target_status = status;
-        _relays[i].change_time = millis();
+        #ifdef RELAY_PROVIDER_STM
+            _relays[i].change_time = millis() + 3000 + 1000 * i;
+        #else
+            _relays[i].change_time = millis();
+        #endif
         bit <<= 1;
     }
 
diff --git a/code/platformio.ini b/code/platformio.ini
index c85eedf8..de624ad3 100644
--- a/code/platformio.ini
+++ b/code/platformio.ini
@@ -1399,6 +1399,31 @@ upload_speed = 460800
 monitor_baud = 115200
 extra_scripts = ${common.extra_scripts}
 
+[env:stm-relay-ota]
+platform = ${common.platform}
+framework = arduino
+board = esp01_1m
+board_flash_mode = dout
+lib_deps = ${common.lib_deps}
+lib_ignore = ${common.lib_ignore}
+build_flags = ${common.build_flags_1m} -DSTM_RELAY
+monitor_baud = 115200
+extra_scripts = ${common.extra_scripts}
+
+[env:stm-relay-ota]
+platform = ${common.platform}
+framework = arduino
+board = esp01_1m
+board_flash_mode = dout
+lib_deps = ${common.lib_deps}
+lib_ignore = ${common.lib_ignore}
+build_flags = ${common.build_flags_1m} -DSTM_RELAY
+upload_speed = 115200
+upload_port = "192.168.4.1"
+upload_flags = --auth=fibonacci --port 8266
+monitor_baud = 115200
+extra_scripts = ${common.extra_scripts}
+
 # ------------------------------------------------------------------------------
 # GENERIC OTA ENVIRONMENTS
 # ------------------------------------------------------------------------------