feat: add endpoints for sending and polling messages

db.py

@@ -1,4 +1,4 @@
-from dto import Device, SimCard, SmsMessage
+from dto import Device, SimCard, SmsMessage, QueuedSmsMessage
 
 
 def get_all_devices(cur) -> list[Device]:
@@ -31,3 +31,28 @@ def get_sms_messages_by_local_phone_number(cur, local_phone_number: str) -> list
     for item in msgs_from_db:
         msgs.append(SmsMessage.convert(item))
     return msgs
+
+
+def send_sms_message(cur, content: str, sender_access_key: str, local_phone_number: str, remote_phone_number: str) -> bool:
+    if content is None or not content \
+            or sender_access_key is None or not sender_access_key \
+            or local_phone_number is None or not local_phone_number \
+            or remote_phone_number is None or not remote_phone_number:
+        return False
+
+    cur.execute("INSERT INTO message_queue VALUES (?, ?, ?, ?)", \
+            (content, sender_access_key, local_phone_number, remote_phone_number))
+    cur.commit()
+    return True
+
+
+def get_queued_sms_messages(cur, local_phone_number) -> list[QueuedSmsMessage]:
+    if local_phone_number is None or not local_phone_number:
+        return []
+
+    msgs_from_db = cur.execute("DELETE FROM message_queue WHERE local_phone_number = ? RETURNING *", (local_phone_number,)).fetchall()
+    cur.commit()
+    msgs = []
+    for item in msgs_from_db:
+        msgs.append(QueuedSmsMessage.convert(item))
+    return msgs