I need to use ESP8266 standalone. I want to connect HM-10 bluetooth module to it and fire its AT commands and read the UUID of devices nearby.
I can do that by firing AT commands on HM-10 from Arduino and FT232RL. But how do I do it in Lua?
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Not sure I understand...you want to connect an HM-10 to an ESP8266, then read data _from_ HM-10 using NodeMCU / Lua? – Marcel Stör Apr 22 '16 at 14:09
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Thats right. And then send it using MQTT. The sending part is done. – Dushyant Bangal Apr 22 '16 at 14:16
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Need to fire the AT command of HM-10, not ESP – Dushyant Bangal Apr 22 '16 at 14:16
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1Wire the HM-10 to Rx/TX and then read data using the UART module: http://nodemcu.readthedocs.org/en/dev/en/modules/uart/. – Marcel Stör Apr 22 '16 at 14:19
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@MarcelStör thanks! It was very easy. Please post it as an answer. – Dushyant Bangal Apr 22 '16 at 15:52
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Initially I didn't fully understand what the problem is. So, I was reluctant to give an answer based on vague ideas and assumptions. So, it seems you have an Arduino BT from which you send data to an HM-10 which is connected to the ESP8266. What the FT232RL's role is I still don't understand but it doesn't seem relevant in the context of the question.
Wire/solder the HM-10 pins 1 & 2 to the ESP8266 RX/TX. Then you can read data using the NodeMCU UART module: https://nodemcu.readthedocs.org/en/dev/en/modules/uart. uart.on() allows to register callbacks triggered when data is received.
In case your ESP device is a NodeMCU devkit you might have to use uart.alt() depending on which RX/TX pins the HM-10 is connected to. The devkit has more than one set of RX/TX pins, see https://github.com/nodemcu/nodemcu-devkit-v1.0/.
Marcel Stör
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I'm using the HM-10 to scan for iBeacons. I was able to fire the AT commands from Arduino and FT232RL, but didnt know how to do it from Lua. Thanks! :) – Dushyant Bangal Apr 25 '16 at 09:40