diff --git a/atcmd b/atcmd
new file mode 100644
index 0000000..9c9a9f9
--- /dev/null
+++ b/atcmd
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+# AT Command Script Variables and Functions
+TMP_DIR="/tmp"
+DEVICE_FILE="/dev/smd7"
+TIMEOUT=4  # Set a timeout for the response
+
+start_listening() {
+    cat "$DEVICE_FILE" > /tmp/device_readout &
+    CAT_PID=$!
+}
+
+send_at_command() {
+    echo "Enter AT command (or type 'exit' to quit): "
+    read at_command
+    if [ "$at_command" = "exit" ]; then
+        return 1
+    fi
+    echo -e "${at_command}\r" > "$DEVICE_FILE"
+}
+
+wait_for_response() {
+    local start_time=$(date +%s)
+    local current_time
+    local elapsed_time
+
+    echo "Command sent, waiting for response..."
+    while true; do
+        if grep -qe "OK" -e "ERROR" /tmp/device_readout; then
+            echo "Response received:"
+            cat /tmp/device_readout
+            return 0
+        fi
+        current_time=$(date +%s)
+        elapsed_time=$((current_time - start_time))
+        if [ "$elapsed_time" -ge "$TIMEOUT" ]; then
+            echo "Error: Response timed out."
+            return 1
+        fi
+        sleep 1
+    done
+}
+
+cleanup() {
+    kill "$CAT_PID"
+    wait "$CAT_PID" 2>/dev/null
+    rm -f /tmp/device_readout
+}
+
+    if [ -c "$DEVICE_FILE" ]; then
+        while true; do
+            start_listening
+            send_at_command
+            if [ $? -eq 1 ]; then
+                cleanup
+                break
+            fi
+            wait_for_response
+            cleanup
+        done
+    else
+        echo "Error: Device $DEVICE_FILE does not exist or is not a character special file."
+    fi