fix: add read/write tests by starting frost server, fix datastream serialization

Author: uwzm

frost_server/docker-compose.yaml

@@ -0,0 +1,38 @@
+services:
+  web:
+    image: docker.io/fraunhoferiosb/frost-server:latest
+    environment:
+      # For all settings see: https://fraunhoferiosb.github.io/FROST-Server/settings/settings.html
+      - serviceRootUrl=http://localhost:8080/FROST-Server
+      - plugins_multiDatastream.enable=false
+      - http_cors_enable=true
+      - http_cors_allowed_origins=*
+      - persistence_db_driver=org.postgresql.Driver
+      - persistence_db_url=jdbc:postgresql://database:5432/sensorthings
+      - persistence_db_username=sensorthings
+      - persistence_db_password=ChangeMe
+      - persistence_autoUpdateDatabase=true
+    ports:
+      - 8080:8080
+      - 1883:1883
+    depends_on:
+      database:
+        condition: service_healthy
+
+  database:
+    image: docker.io/postgis/postgis:16-3.4-alpine
+    environment:
+      - POSTGRES_DB=sensorthings
+      - POSTGRES_USER=sensorthings
+      - POSTGRES_PASSWORD=ChangeMe
+    volumes:
+      - postgis_volume:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -d sensorthings -U sensorthings "]
+      interval: 2s
+      timeout: 2s
+      retries: 10
+
+volumes:
+    postgis_volume:
+