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Hello Ryan,
by the Cinterion modules, the SPI is managed through AT commands. TC65i module can handle it through Java APIs, the same applies for the Telit's module and Python.
Well I am still worried about the quality of low-cost modules made by Simcom.
The board-to-board interface connectors are standard in M2M industry. They're designed to be durable and they really hold the module on its place. Besides the modules do have additional mounting holes to mount it with...
project
Ad 1.: Depends on, what kind of GSM module / modem are you going to use and also what technology will transmit your data. SMS are limited up to 160chars / message, but if you'll use GPRS / EDGE / ... it will transfer your data just fine, but it needs little programming on both sides though.
You don't have to go with chinese modules. In case of such qty you can purchase German Cinterions. These guys https://www.wivia.com/c/viewcat/catid-16/gsm have prices for 1pc almost at the same level, that you require for 1k lot.
I don't know, what is your application, but the're ready to go MC55i versions with interface such as https://www.wivia.com/p/productid-13/cinterion-siemens-mc55i-embedded-modem or https://www.wivia.com/p/productid-42/cinterion-mc55i-gsm-terminal
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