ORANGEPI ZERO + SIM7100E + UART

Hello,

Has anyone tried to bring up a SIM7100E based hat on Orange PI Zero over the UART GPIO interface?  I have enabled the UART ports in armbianEnv.txt as follows:

overlay_prefix=sun8i-h3

overlays=usbhost2 usbhost3 uart1 uart2

dmesg | grep tty shows :

[    0.000379] console [tty1] enabled

[    1.765329] console [ttyS0] disabled

[    1.785581] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 39, base_baud = 1500000) is a U6_16550A

[    1.785700] console [ttyS0] enabled

[    1.810679] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 40, base_baud = 1500000) is a U6_16550A

[    1.835564] 1c28800.serial: ttyS2 at MMIO 0x1c28800 (irq = 41, base_baud = 1500000) is a U6_16550A

I have connected the TX/RX pins as in the picture : http://linux-sunxi.org/File:OPi_Zero_UART.jpg to corresponding RX/TX ports on the SIM7100E module.  The SIM7100E module I am using is :  https://www.aliexpress.com/item/EU-Network-SIM7100E-4G-Module-Development-Board-Antenna-for-Arduino-Raspberry-Pi-Android-Linux-Windows/32864790020.html

The module works fine on a standard linux Desktop running Ubuntu and am now trying to bring it up on Orange Pi Zero.

Any help is much appreciated.

Thank You.