ThingSpeak

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I am using a free license for publishing data with MQTT on ThingSpeak which works very good, according to the format: channels/<channelID>/publish/fields/field<fieldnumber>. Can I subscribe my channel(s) with MQTT with a free license with the format: channels/<channelID>/subscribe/fields/field<fieldnumber>. Or is there any restriction? Thanks for your answer and best regards.

Hi everyone, can you tell me how many fields of a single channel can I update with a single command, with a free thingspeak license? I know that I can create a maximum of 4 channels, each one with 8 fields, but I can't update more than 4 fields. I selected 5 fields and I sent a single string with the 5 values to update, but no data was shown; conversely, if i send a string with 4 fields to update (or 3 fields + the status), it works. I posted the code that i used with the 'GET' command; as long as I try to update 4 (or less) fields it always works without issues. So I would like to know if I need to purchase a license in order to use more than 4 fields of a channel, and if the student license would be fine. Thank you // data string to send to ThingSpeak String data="GET https://api.thingspeak.com/update?api_key=" + wKey + "&field1=" + String(PM1,2) +"&field2=" + String(PM25,2) + "&field3=" + String(PM10,2) + "&field4=" + String(H,2) + "&field5=" + String(T,2); // + "&status=" + String("status"); SIM.println("AT+CIPSEND"); //begin send data to remote server delay(4000); SIM.println(data); // send data to remote server delay(4000); SIM.println((char)26);