[mh] Installing Tasmota firmware on Sonoff OTA devices

Installing Tasmota on Sonoff 3.5.0+ (OTA) devices is slightly fiddly, 
but one nice thing about these "DIY" devices is that they requires no 
special apps to setup.  I installed mine using a browser on my phone and 
curl on my MH machine.  I also used apache to serve the firmware, but I 
think I could have just pointed them to the Tasmota OTA server if I wanted.

Here is the basic procedure:

Plug in/turn on the device.  When it boots, enter AP setup mode by 
holding the device button for 5+ seconds until the blue light begins to 
flash with a new pattern.  Release the button and begin holding the 
device button again for 5+ seconds until the blue light begins to flash 
approx. twice per second.  Then use a WiFi device, such as a smart 
phone, to connect to the Sonoff AP with SSID: ITEAD-xxxxxxx and 
password: 12345678

Use your WiFi device browser to visit: http://10.10.7.1/ and set the 
correct WiFi AP parameters.  The device will reboot and be reachable 
from the WiFi AP.  Use this command to confirm the device is in DIY mode:

curl -X POST |-H "Content-Type: application/json" |||-d 
'{||||||"deviceid":"", ||"data":{}}' 
http://<Sonoff_IP_address>:8081/zeroconf/info
||

If a response is received with no errors in the reply, then proceed to 
update the firmware with the setup-sonoff-mini.sh script posted below.  
Note that the device will require internet access to perform the unlock.

Below is a simple bash script to take care of most of the typing.  Be 
sure to replace http://<server_ip>/<firmware_path>/tasmota-lite.bin with 
the right URL for your firmware server.  Also update the sha256sum if 
you are not using release 9.1.0.

#!/bin/bash

# setup-sonoff.sh - Script to automate upgrading Sonoff DIY devices to 
Tasmota firmware
# Copyright (C) 2020 Jeff Siddall
# Last modified: 2020-12-14

# Exit if any of the spawned commands has failed (exits non-zero)
set -e

# Check for the right arguments
if [ $# -ne 1 ]; then
    echo "Usage: setup-sonoff-mini.sh <ip_address>"
    echo "   where <ip_address> is the IP address of the device to upgrade"
    exit 1
fi

# Print the current device info
echo "Current configuration:"
curl -X POST -H "Content-Type: application/json" -d '{"deviceid":"", 
"data":{}}' http://$1:8081/zeroconf/info
echo
echo "Enabling unlock (note: device requires internet access):"
curl -X POST -H "Content-Type: application/json" -d '{"deviceid":"", 
"data":{}}' http://$1:8081/zeroconf/ota_unlock
echo
echo "Starting firmware upgrade:"
curl -X POST -H "Content-Type: application/json" -d '{"deviceid":"", 
"data":{"downloadUrl":"http://<server_ip>/<firmware_path>/tasmota-lite.bin", 
"sha256sum":"b8a16f18a018bd6233170ce28a625508c38770d9d8ef195c7afa50f914c4ac9c"}}' 
http://$1:8081/zeroconf/ota_flash
echo
echo "The upgrade will take several minutes, after which time the device 
will reboot"

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