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我正在尝试在 bash 中创建一个脚本，以便为 Domoticz 中的 3 个虚拟传感器重新发布 1 条 MQTT 消息。我在为 mossquito_pub 命令创建消息部分时遇到了麻烦

#!/bin/bash
# This script subscribes to a MQTT topic using mosquitto_sub.
# On each message received, you can execute whatever you want.

while true  # Keep an infinite loop to reconnect when connection lost/broker unavailable
do
    mosquitto_sub -h "192.168.1.30" -t "tele/tasmota_D875F9/SENSOR" | while read -r payload
    do
        # Here is the callback to execute whenever you receive a message:
        str="${payload}"
        voltage1= echo $str | cut -f 22 -d ','|  tr -dc '0-9'
        echo $voltage1
        mosquitto_pub -h 192.168.1.30 -p 1883 -t 'domoticz/in' -m  '{"idx" : 33, "nvalue" : 0, "svalue" : "$voltage1" }'
        voltage2= echo $str | cut -f 23 -d ','|  tr -dc '0-9'
        echo $voltage2
        mosquitto_pub -h 192.168.1.30 -p 1883 -t 'domoticz/in' -m  '{"idx" : 34, "nvalue" : 0, "svalue" : "$voltage2" }'
        voltage3= echo $str | cut -f 24 -d ','|  tr -dc '0-9'
        echo $voltage3
        mosquitto_pub -h 192.168.1.30 -p 1883 -t 'domoticz/in' -m  '{"idx" : 35, "nvalue" : 0, "svalue" : "$voltage3" }'
    done

    sleep 10  # Wait 10 seconds until reconnection
done # &  # Discomment the & to run in background (but you should rather run THIS script in background)


    sleep 10  # Wait 10 seconds until reconnection
done # &  # Discomment the & to run in background (but you should rather run THIS script in background)

目前，终端回显输出为：

230
231
233

传递的信息：

2020-12-01 13:51:27.952 MQTT: Topic: domoticz/in, Message: {"idx" : 33, "nvalue" : 0, "svalue" : "$voltage1" }
2020-12-01 13:51:28.057 MQTT: Topic: domoticz/in, Message: {"idx" : 34, "nvalue" : 0, "svalue" : "$voltage2" }
2020-12-01 13:51:28.161 MQTT: Topic: domoticz/in, Message: {"idx" : 35, "nvalue" : 0, "svalue" : "$voltage3" }

我需要将变量voltage1, voltage2,voltage3替换为它们的值，因为它们在终端回显输出中看到，包括前面和后面的引号。

请帮我。

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