I know there is a lot of Q&A’s on this topic and believe me, I have read most of them
However, I have not found what I am looking for:
I have a SIM800C board which plugs directly into a USB port of my Raspberry PI running Home Assistant. The board is listed as one of the boards approved to be used with the SMS integration in HA.
When I try to set up SMS notification the message is: “Just follow the instructions”. I found no instructions - I only see a small popup asking for the Device and the Baud speed.
My guess is that the Device is the USB device where the Modem is connected so I used ls -l /dev/tty to find the name of my device and found two which are marked “dialout”, One is /dev/ttyACM0 which should indicate it is a Modem and the other is /dev/ttyUSB0. ttyACM0 was detected today when I plugged in the modem, so I used that.
First try entering “ttyACM0” failed so I entered “/dev/ttyACM0” and it was accepted but after a l o n g time the popup states “unknown error” and “failed to connect”. If I try /dev/ttyUSB0 the result is the same.
EDIT: Looking into the hardware listed for my Raspbrry in HA I saw that the ttyACM0 is my Zigbee dongle thus the Modem must be the ttyUSB0:
Subsystem:
tty
Device path:
/dev/ttyUSB0
ID:
/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
Attributes:
DEVLINKS: >-
/dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.4:1.0-port0
DEVNAME: /dev/ttyUSB0
DEVPATH: >-
/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.4/1-1.4:1.0/ttyUSB0/tty/ttyUSB0
ID_BUS: usb
ID_MODEL: USB_Serial
ID_MODEL_ENC: USB\x20Serial
ID_MODEL_ID: ‘7523’
ID_PATH: platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.4:1.0
ID_PATH_TAG: platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1_4_1_0
ID_REVISION: ‘0264’
ID_SERIAL: 1a86_USB_Serial
ID_TYPE: generic
ID_USB_DRIVER: ch341
ID_USB_INTERFACES: ‘:ff0102:’
ID_USB_INTERFACE_NUM: ‘00’
ID_USB_MODEL: USB_Serial
ID_USB_MODEL_ENC: USB\x20Serial
ID_USB_MODEL_ID: ‘7523’
ID_USB_REVISION: ‘0264’
ID_USB_SERIAL: 1a86_USB_Serial
ID_USB_TYPE: generic
ID_USB_VENDOR: 1a86
ID_USB_VENDOR_ENC: 1a86
ID_USB_VENDOR_ID: 1a86
ID_VENDOR: 1a86
ID_VENDOR_ENC: 1a86
ID_VENDOR_ID: 1a86
MAJOR: ‘188’
MINOR: ‘0’
SUBSYSTEM: tty
TAGS: ‘:systemd:’
USEC_INITIALIZED: ‘9658235’
I have not been able to find a log showing the error messages or the communication between HA and the SIM800?
I appreciate any help on this as my other path to a solution (I only want to receive SMS from my alarm system as a trigger) is to use an ESP32 with a SIM800L running micropython. When the alarm system sends the SMS that board will send to HA using MQTT or maybe just use an output pin being read by one of my ESPhome CPUs.
