Setoption15 section at the bottom, explain the SwitchText Command to …

[YvesLev]

…change default "Switch1" text in the tele mqtt msg.

In the SwitchMode 15 section at the bottom, explain the SwitchText Command to change default "Switch1" text in the tele mqtt msg. Also, explain that the use of Setoption114 1 and SwitchMode 15 together will make HA Tasmota Integration creating a binary sensor in HA : binary_sensor.switch1. (switch1 can be change according to SwtichText command).