I am looking at using these shields on an Uno:
Now I am looking for some help reference using software serial. The SIM900 uses pins D7 and D8 for tx/rx software serial, and D9 for powering on. The Wifi uses pins D8 and D9 for tx/rx software serial. The GPS has this little breakout to allow me to connect the tx/rx software serial to any digital pin:
So my question is: Can I just reroute all the software serial pins on each shield to different digital pins without any issue (even though the documentation lists a specific digital pin)? As in, can I leave the SIM900 to use it's default D7 and D8. Then not plug the Wifi headers into D8 and D9 and reroute them to D5 and D6. Then also doing the same thing to reroute the GPS to D3 and D4.
Giving me software serial pins of: SIM900 on D7 and D8 Wifi on D5 and D6 GPS on D3 and D4
Giving me all shields on software serial and avoiding the use of D0 and D1.