unffort it seems Frud doesnt have the android app available on google drive anymore, but i still have it on one of my drives somewhere and ill email it to you if going to build it ,its actualy pretty easy to set this up i used a D1 mini esp8266,bi directional logic converter,and 2 dc to dc converters oneset to 3.3 volt and other to 5 volt ,
There is also another android dash app called ebike analyzer 1.2 you just connect a bt module hc-06 for memoryto the ca tx/rx/grnd with 5volt to vcc,open the app and it connects itself ,if anyone is genuinely building either ill draw up the circuit diagrams for them cheers KT