Shelly1 and mqtt 2.4.0 Binding

For me it works as follow:
Things:

Thing mqtt:topic:OG1_ba_li_schalter "OG1_ba_li_schalter" (mqtt:broker:mosquitto) {
        Channels:
        Type string : online    "Online"        [ stateTopic="shellies/shellyswitch25-xxx13/online" ]
        Type switch : power1    "Power1"        [ stateTopic="shellies/shellyswitch25-xxx13/relay/0", on="on", off="off", commandTopic="shellies/shellyswitch25-xxx13/relay/0/command", on="on", off="off"]
        Type switch : power2    "Power2"        [ stateTopic="shellies/shellyswitch25-xxx13/relay/1", on="on", off="off", commandTopic="shellies/shellyswitch25-xxx13/relay/1/command", on="on", off="off"]
        }

Items:

Switch OG1_ba_li_decke "Licht Decke" <light> (gOG1_ba,gOG1_Licht) ["Lighting"]  { channel="mqtt:topic:OG1_ba_li_schalter:power1" }
Switch OG1_ba_li_spiegel "Licht Spiegel" <light> (gOG1_ba,gOG1_Licht) ["Lighting"]  { channel="mqtt:topic:OG1_ba_li_schalter:power2" }

Quite easy and simple.