3 replies to this topic

[tomasmcguinness]

Hello, I recently purchased a Bluetooth module from RedBearLabs and hooked it up to COM2 on my Netduino. I can successfully send data from the Netduino to an iOS app, but I cannot receive any data. I've set up a SerialPort, set the baud to 57600 as recommended and subscribed to the DataReceived event on the SerialPort. It opens successfully and as I've mentioned, I can send data. SerialPort sp = new SerialPort("COM1"); sp.BaudRate = 57600; sp.Handshake = Handshake.None; sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived); sp.Open(); Thread.Sleep(Timeout.Infinite); Is there anything else I need to think about on the receiving side? Thanks, Tom

[Nevyn]

Not sure which version of the firmware you have on the Netduino but there was a bug in older versions where the event handler would not fire if the handler was wired up before the port was opened.  So first thing I'd try is to swap the order of the sp.DataReceived and sp.Open statements.

 

Do you have access to a logic analyser or a scope?  If you do then can you check if there is any data going out on to the serial bus.

 

If no data is going over the bus then it suggests the problem is with the iOS app although I found RedBear's library really simple to use.

 

Regards,

Mark

[tomasmcguinness]

Mark, Thanks for the reply. I tried the reversing the code, but that hasn't had any effect. I updated my Netduino to version 4.2, to be sure it wasn't firmware related, but still no luck. The Netduino can send a byte to iOS, but not the other way around. I don't have a scope, so I'm unable to test the output on the pins themselves. I'll have another look through my iOS code. Thanks, Tom

[tomasmcguinness]

Mark, I updated the firmware on the BLE mini and it's working okay now! Might have been an iOS 7 related issue. Thx.