https://mining.cafe/

• Mainnet port is 8533, -p c=D
• Testnet port is 3333, -p c=TEST

If mining on a raspberry pi4 using compiled cpuminer use -p c=TEST,d=0.01 to bring difficulty slightly lower for the smaller hashrate.

Using same port was giving hashrate bleed. Testnet dedicated port 3333 is set at 0.01 diff and mainnet dedicated port 8533 is set at 0.25.