I am working on a server and client project which is distributed around the country. Client should send data regularly to server (namely every half an hour). Clients are located in some desolated locations, and there is no internet or mobile broadband coverage there. The only possibility is using landline.
I cannot find any IC to interfacing landline. would you please tell me which chip or IC is used for that purpose?
For example, I use atmega32 with enc28j60 with spi port for Ethernet controller, and sim800 with uasrt port for sending sms, but what about point-to-point connection to landline telephone?
Thanx in advance.