====== Gosund SP111 Smart Plug ======

How to reflash with custom firmware using OTA: [[https://github.com/ct-Open-Source/tuya-convert|TUYA-CONVERT]]
OLD method: [[https://github.com/SynAckFin/TuyOTA|TuyOTA]]

I was using ''tasmota-lite.bin v9.2.0'' firmware.
<code bash>
pushd files
wget tasmota-lite.bin v9.2.0 
popd
</code>

''tuya-covert'' needs small fix for calling ''iw'' binary on Debian Buster: 

<code bash>
======================================================
Starting smart config pairing procedure
Waiting for the device to install the intermediate firmware
Put device in EZ config mode (blinking fast)
Sending SSID                  vtrust-flash
Sending wifiPassword          
Sending token                 00000000
Sending secret                0101
................
SmartConfig complete.
Resending SmartConfig Packets
..................................
IoT-device is online with ip 10.42.42.42
Fetching firmware backup
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1024k  100 1024k    0     0  69658      0  0:00:15  0:00:15 --:--:-- 32846
curl: Saved to filename 'firmware-1a94dd.bin'
======================================================
Getting Info from IoT-device
VTRUST-FLASH 1.5
(c) VTRUST GMBH https://www.vtrust.de/35c3/
READ FLASH: http://10.42.42.42/backup
ChipID: 1a94dd
MAC: 50:02:91:1A:94:DD
BootVersion: 7
BootMode: normal
FlashMode: 1M DOUT @ 40MHz
FlashChipId: 144051
FlashChipRealSize: 1024K
Active Userspace: user2 0x81000
======================================================
Ready to flash third party firmware!

For your convenience, the following firmware images are already included in this repository:
  Tasmota v8.1.0.2 (wifiman)
  ESPurna 1.13.5 (base)

You can also provide your own image by placing it in the /files directory
Please ensure the firmware fits the device and includes the bootloader
MAXIMUM SIZE IS 512KB

Available options:
  0) return to stock
  1) flash espurna.bin
  2) flash tasmota.bin
  3) flash tasmota-lite.bin
  q) quit; do nothing
Please select 0-3: 2
Are you sure you want to flash tasmota.bin? This is the point of no return [y/N] y
Attempting to flash tasmota.bin, this may take a few seconds...
Flashed http://10.42.42.1/files/tasmota.bin successfully in 11289ms, rebooting...
Look for a tasmota-xxxx SSID to which you can connect and configure
Be sure to configure your device for proper function!

HAVE FUN!
======================================================
Do you want to flash another device? [y/N] y
======================================================

</code>

====== ESPHome Config ======

[[https://github.com/jaddel/ESPhome/blob/master/Devices/Smart%20Plug%20-%20Gosund%20SP111|Smart Plug - Gosund SP111]]
[[https://frenck.dev/calibrating-an-esphome-flashed-power-plug/|Calibrating an ESPHome flashed power plug]]

<file yaml gosund_sp1.yaml>
esphome:
  name: gosund_pralka
  platform: ESP8266
  board: esp01_1m
  esp8266_restore_from_flash: true

wifi:
  ssid: "myssid"
  password: "mypass"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Gniazdko Sp biuro"
    password: "Tmk9tzAUQmr8"

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:

binary_sensor:
  - platform: gpio
    name: "Power Button"
    pin:
      number: GPIO13
      inverted: true
    on_press:
      - switch.toggle: relay

switch:
  - platform: gpio
    id: relay
    name: ON/OFF
    pin: GPIO15
    on_turn_on:
      - light.turn_on: led
    on_turn_off:
      - light.turn_off: led


time:
  - platform: homeassistant
    id: homeassistant_time
    timezone: Europe/Warsaw
    
substitutions:
  plug_name: GspBiuro 
  # Higher value gives lower watt readout
  current_res: "0.0012"
  # Lower value gives lower voltage readout
  voltage_div: "771"

# Enable Web server
web_server:
  port: 80

sensor:
  - platform: wifi_signal
    name: "${plug_name} - WiFi Signal"
    update_interval: 6s
  
  - platform: uptime
    name: "${plug_name} - Uptime"
    icon: mdi:clock-outline
    update_interval: 60s
    
  - platform: hlw8012
    sel_pin:
      number: GPIO12
      inverted: True
    cf_pin: GPIO05
    cf1_pin: GPIO04
    current_resistor: ${current_res}
    voltage_divider: ${voltage_div}
    
    current:
      name: "${plug_name} - Ampere"
      unit_of_measurement: A
      accuracy_decimals: 3
      icon: mdi:flash-outline
      
    voltage:
      name: "${plug_name} - Volt"
      unit_of_measurement: V
      accuracy_decimals: 1
      icon: mdi:flash-outline
      
    power:
      name: "${plug_name} - Watt"
      unit_of_measurement: W
      id: "${plug_name}_Wattage"
      icon: mdi:flash-outline
      
    change_mode_every: 4
    update_interval: 3s
    
  - platform: total_daily_energy
    name: "${plug_name} - Consumption"
    power_id: "${plug_name}_Wattage"
    filters:
        # Multiplication factor from W to kW is 0.001
        - multiply: 0.001
    unit_of_measurement: kWh
    icon: mdi:clock-alert 

text_sensor:
  - platform: version
    name: "${plug_name} - ESPHome Version"

output:
  # Relay state led
  - platform: esp8266_pwm
    id: state_led
    pin:
      number: GPIO2
      inverted: true

light:
  # Relay state light
  - platform: monochromatic
    output: state_led
    id: led

# Uses the red LED as a ESPhome status indicator
status_led:
  pin:
    number: GPIO0
    inverted: true
    
</file>

Upgrade from Tasmota:
<code bash>
run esphome config.yaml compile

Creating BIN file ".pioenvs/gosund_1a5f71/firmware.bin" using "/root/.platformio/packages/framework-arduinoespressif8266/bootloaders/eboot/eboot.elf" and ".pioenvs/gosund_1a5f71/firmware.elf"
</code>

Or ''compile'' and ''download binary'' from dashboard.