I am designing a GPS tracker which takes GPS data from GPS module(Neo 6M) and through PPPos connection will send it to Google IOT cloud, I am able to run both modules independently and they work perfectly.
But when i connect them together on UART2->(GMS) and UART1->(GPS), ppp connection becomes less reliable and fails very frequently. On changing the GPS's update interval the behavior of GSM connection changes. I am unable to figure out what the problem is.. Please help me with this..