I used cc2530 MCU to send other AT MQTT instructions to EspWiFi module can respond successfully, Only the two instructions of AT+MQTTPUB and AT+MQTTSUB are invalid and there is no response, neither of which is erro. However, I can successfully respond to these two commands sent to ESP by USB to TTL through serial port tool. At first, I thought it was because of the format. I printed these two lines of commands to the serial port tool, then copied them to the serial port tool and sent them to ESP.
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