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Building the firmware

Start from https://github.com/arendst/Sonoff-Tasmota. Apply the following patch, fixing the contents of STA_PASS1.

diff --git a/platformio.ini b/platformio.ini
index cb5da39..2fde240 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -65,7 +65,7 @@ monitor_speed = 115200
 ;upload_speed = 115200
 upload_speed = 512000
 upload_resetmethod = nodemcu
-upload_port = COM5
+upload_port = /dev/ttyUSB0
 ; *** Fix Esp/Arduino core 2.4.x induced Tasmota unused floating point includes
 extra_scripts = pio/strip-floats.py
 
@@ -331,3 +331,20 @@ monitor_speed = ${common.monitor_speed}
 upload_speed = ${common.upload_speed}
 upload_port = ${common.upload_port}
 extra_scripts = ${common.extra_scripts}
+
+[env:wemos-d1-mini]
+platform = espressif8266
+framework = arduino
+board = esp01_1m
+board_flash_mode = dout
+build_flags = -Wl,-Tesp8266.flash.1m0.ld -DMQTT_MAX_PACKET_SIZE=1000
+lib_deps = PubSubClient, NeoPixelBus, IRremoteESP8266, ArduinoJSON
+extra_scripts = pio/strip-floats.py
+
+; *** Serial Monitor options
+monitor_baud = 115200
+
+; *** Upload Serial reset method for Wemos and NodeMCU
+upload_resetmethod = nodemcu
+upload_speed = 115200
+;upload_port = COM6
diff --git a/sonoff/user_config.h b/sonoff/user_config.h
index 8cc07d3..a09444b 100644
--- a/sonoff/user_config.h
+++ b/sonoff/user_config.h
@@ -59,8 +59,8 @@
 #define WIFI_SUBNETMASK        "255.255.255.0"   // [IpAddress3] If not using DHCP set Network mask
 #define WIFI_DNS               "192.168.2.27"    // [IpAddress4] If not using DHCP set DNS IP address (might be equal to WIFI_GATEWAY)
 
-#define STA_SSID1              ""                // [Ssid1] Wifi SSID
-#define STA_PASS1              ""                // [Password1] Wifi password
+#define STA_SSID1              "0x20"            // [Ssid1] Wifi SSID
+#define STA_PASS1              "[redacted]"      // [Password1] Wifi password
 #define STA_SSID2              ""                // [Ssid2] Optional alternate AP Wifi SSID
 #define STA_PASS2              ""                // [Password2] Optional alternate AP Wifi password
 #define WIFI_CONFIG_TOOL       WIFI_WPSCONFIG    // [WifiConfig] Default tool if wifi fails to connect
@@ -79,7 +79,7 @@
 // -- MQTT ----------------------------------------
 #define MQTT_USE               1                 // [SetOption3] Select default MQTT use (0 = Off, 1 = On)
 
-#define MQTT_HOST              ""                // [MqttHost]
+#define MQTT_HOST              "buzz.0x20"       // [MqttHost]
 #define MQTT_FINGERPRINT1      "A5 02 FF 13 99 9F 8B 39 8E F1 83 4F 11 23 65 0B 32 36 FC 07"  // [MqttFingerprint1]
 #define MQTT_FINGERPRINT2      "A5 02 FF 13 99 9F 8B 39 8E F1 83 4F 11 23 65 0B 32 36 FC 07"  // [MqttFingerprint2]
 #define MQTT_PORT              1883              // [MqttPort] MQTT port (10123 on CloudMQTT)
@@ -121,7 +121,7 @@
 // -- HTTP ----------------------------------------
 #define WEB_SERVER             2                 // [WebServer] Web server (0 = Off, 1 = Start as User, 2 = Start as Admin)
 #define WEB_PASSWORD           ""                // [WebPassword] Web server Admin mode Password for WEB_USERNAME (empty string = Disable)
-#define FRIENDLY_NAME          "Sonoff"          // [FriendlyName] Friendlyname up to 32 characters used by webpages and Alexa
+#define FRIENDLY_NAME          "Sonoff SV"       // [FriendlyName] Friendlyname up to 32 characters used by webpages and Alexa
 #define EMULATION              EMUL_NONE         // [Emulation] Select Belkin WeMo (single relay/light) or Hue Bridge emulation (multi relay/light) (EMUL_NONE, EMUL_WEMO or EMUL_HUE)
 
 // -- Time - Up to three NTP servers in your region
@@ -232,7 +232,7 @@
 // -- HTTP ----------------------------------------
 #define USE_WEBSERVER                            // Enable web server and wifi manager (+66k code, +8k mem)
   #define WEB_PORT             80                // Web server Port for User and Admin mode
-  #define WEB_USERNAME         "admin"           // Web server Admin mode user name
+  #define WEB_USERNAME         "0x20"            // Web server Admin mode user name
   #define USE_EMULATION                          // Enable Belkin WeMo and Hue Bridge emulation for Alexa (+16k code, +2k mem)
 
 // -- mDNS ----------------------------------------

Follow the instructions on the above project's wiki to build and install the firmware.

Configuration

Watch the MQTT channels tele/sonoff/INFO1 and tele/sonoff/INFO2 on buzz (username pi/password [redacted]). (e.g., mosquitto_sub -h buzz.0x20 -v -t "tele/sonoff/#") while the device is first booted.

You will see:

tele/sonoff/INFO1 {"Module":"Sonoff Basic","Version":"5.14.0b","FallbackTopic":"DVES_8E52C7","GroupTopic":"sonoffs"}
tele/sonoff/INFO2 {"WebServerMode":"Admin","Hostname":"sonoff-4807","IPAddress":"10.20.1.127"}

There may be other lines between these.

Note the suffix after DVES in the first line and after sonoff- in the second. Make a label containing those suffixes separated by a slash, e.g., for the above lines, the label would be 8E52C7/4807.

For raw ESP8266 devices (such as a wemos), go to sonoff-4807.0x20 (replacing the suffix with the second part of the label), go to "Configure/Configure module", set the device type to "18 Generic", then go back to that menu and configure the pins as desired. Note that, in order to get separate outputs per button/switch, you need to put a relay the same channel as the button. (shakes fist at cloud)

I found the following messages useful:

# Set switches to send both transitions. 2 is the same but inverted
cmnd/DVES_189EE1/SwitchMode 1
# Set target device to control from switches. No message controls itself
cmnd/DVES_189EE1/SwitchTopic DVES_1141BC
# Control target device from buttons
cmnd/DVES_189EE1/ButtonTopic DVS_1141BC

# Set relay status (also try ON and OFF)
cmnd/DVES_189EE1/POWER1 TOGGLE