thank you very much for your answer it cleared things up for me.
however I am a little discouraged that the LoRa transmission may not be the adaptable technology for my project which must be in very large rural areas. I must think of another solution. What do you think?
however, it corresponds to my IoT project in the city center.
hence my questions:
I ordered Things Uno which are with me now I must also order my Things gateway as soon as possible but I wanted to be sure of their operation in my country (Africa) which has not yet put regulations on the use of free frequency bands,
However I do think that I can communicate my Things Uno to the Things gateway using their own antennas for example with the 868 Mhz EU frequencies mentioned on the Things Uno. What do you think?
and for the Uno things i need an external antenna or is the internal antenna enough for me to connect it to the gateway?
I tried to register my Uno things on thethingsnetwork platform but it sends a join denied response, is this due to the absence of the network gateway or is it another problem?
also I am wondering if I am using a low cost Ultrasonic Prototyping sensor I will not find accurate results ?. better to order the real more expensive Ultrasonic level sensors for more efficient results. I want your advice please.
other question on the LoRaWAN network server of the ThingsNetwork at some point I must switch to a pay account to view my sensor data? I want to have some information on that.
thank you especially @cslorabox
and for all