botletics/SIM7000-LTE-Shield

📋 Changes

• Change initialization code to use `AT+GMR` to identify module type rather than `ATI`, because for SIM7070 `ATI` does not include module name
• Update LTE_Demo.ino and SIM7XXX_LTE_Demo.ino to reflect SIM7070 changes
• Test SIM7070 support: Connection with Hologram.io SIM card, sending/receiving SMS, network time, read battery level, general functions, HTTP GET requests (tested on T-Mobile LTE CAT-M1 network in the US)

📋 Changes

• Fixed bugs (like incomplete readRTC function)
• Removed module variants for SIM7000 and above (for example, no more distinction in the library between SIM7000A and SIM7000G, or SIM7500A/E)
• Added more explicit commented hardware serial section in example code
• Added preliminary SIM7070 support and HTTP functions
• Added SSL for TCP (for MQTTS), thanks to @ikstvn
• General cleanup work

📋 Changes

• Fixed a bunch of small things
• Added dedicated MQTT commands for SIM7000 and SIM7000_MQTT_Demo.ino example, including subscribing to topics and parsing incoming messages from subscribed topics
• Added printout of server response in postData() function after AT+HTTPREAD command