Send sensor data to T-SIM7080G using AT commands.

Use case:
Why is this important (helps with prioritizing requests)?
⇒　Sensor data is currently being transmitted, so it has medium priority. However, the current method lacks efficiency and flexibility.

Proposal:
Short summary of the feature.
⇒　Allow transmission of multiple data entries with different tags in a single request.

Current behaviour:
Describe what currently happens.
⇒　When tags differ, each data entry must be sent separately, resulting in multiple transmissions.

Desired behaviour:
Describe what you want.
⇒　Enable combining data with different tags into a single payload.
For example:

String payload = "lilygo,sensor=sensor temp=" String(temp);
payload += "\nlilygo,sensor=sensor moisture=" + String(moisture);

Alternatives considered:
Describe other solutions or features you considered.
⇒　A possible workaround is using the same tag with different fields, but this limits tag flexibility and may not be semantically appropriate.

Start by reviewing the existing T-SIM7080G AT-command transmission path and the current sensor-data request format. Confirm how multiple entries with different tags can be represented in one payload, then verify that one request preserves each tag and value.