KC868-A16S GSM/LTE Connection Issue - CSQ=99 (No Signal)

[admin]

1: A16S pcb can connect with SIM800L 2G or SIM7600E 4G module.
2:
GSM:
RXD:GPIO15
TXD:GPIO13
here is ESP32 pin define for A16S: https://www.kincony.com/forum/showthread.php?tid=2788
3: if use our GSM module, not need to use PWR_KEY.
4: SIM7600E: 115200
5: if you use by SIM7600E, you can download KCS v2 firmware directly to use it. Just SIM800L not support KCS v2. if you are using SIM800L, i suggest you use serial monitor to test AT command.