libs/unit: Support NBIoT2.

Signed-off-by: Pandian Nano <[email protected]>

Author: pandiannano

docs/en/refs/unit.nbiot2.ref

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+.. |NB-IOT2Unit| image:: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/products/unit/Unit%20NB-IoT2%20(SIM7028)/4.webp
+    :target: https://docs.m5stack.com/en/unit/Unit%20NB-IoT2(SIM7028)
+    :height: 200px
+    :width: 200 px
+    
+.. |example.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/example.png
+.. |init.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/init.png
+.. |check_modem_is_ready.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/check_modem_is_ready.png
+.. |get_imei_number.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_imei_number.png
+.. |get_signal_strength.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_signal_strength.png
+.. |get_model_identification.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_model_identification.png
+.. |get_gprs_network_status.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_gprs_network_status.png
+.. |get_show_pdp_address.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_show_pdp_address.png
+.. |get_pdp_context_dynamic_parameters.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_pdp_context_dynamic_parameters.png
+.. |set_command_echo_mode.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/set_command_echo_mode.png
+.. |set_gprs_network_state.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/set_gprs_network_state.png
+.. |set_pdp_context_apn.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/set_pdp_context_apn.png
+.. |modem_debug.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/modem_debug.png
+.. |mqtt_server_configure.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_server_configure.png
+.. |mqtt_server_connect.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_server_connect.png
+.. |mqtt_server_disconnect.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_server_disconnect.png
+.. |mqtt_server_is_connect.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_server_is_connect.png
+.. |mqtt_subscribe_callback.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_subscribe_callback.png
+.. |get_topic.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_topic.png
+.. |get_msg.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/get_msg.png
+.. |mqtt_unsubscribe_topic.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_unsubscribe_topic.png
+.. |mqtt_publish_topic.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_publish_topic.png
+.. |mqtt_polling_loop.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/mqtt_polling_loop.png
+.. |http_request.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/http_request.png
+.. |http_terminate.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/http_terminate.png
+.. |data_content.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/data_content.png
+.. |response_code.png| image:: https://static-cdn.m5stack.com/mpy_docs/unit/nbiot2/response_code.png
+
+.. |cores3_nbiot2_example.m5f2| raw:: html
+
+    <a
+        href="https://uiflow2.m5stack.com/?example=https://raw.githubusercontent.com/m5stack/uiflow-micropython/develop/examples/unit/nbiot2/cores3_nbiot2_example.m5f2"
+        target="_blank"
+    >
+        cores3_nbiot2_example.m5f2
+    </a>
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docs/en/units/index.rst

@@ -53,6 +53,7 @@ Unit
     mqtt.rst
     mqttpoe.rst
     nbiot.rst
+    nbiot2.rst
     ncir.rst
     oled.rst
     op90.rst