Packet not received

[gordon13]

I'm trying to send a packet from Python to the Arduino but the handler is never triggered. Maybe I misunderstand the packet format?

I'm using the COBS library to encode the data. Here's the packet as it is sent using the standard python serial library:
b'\x03\x01\x04\x00'

Here's the Arduino code:

#include <PacketSerial.h>
PacketSerial myPacketSerial;

void setup() {
  myPacketSerial.begin(9600);
  myPacketSerial.setPacketHandler(&onPacketReceived);
}

void loop() {
  myPacketSerial.update();
}

void onPacketReceived(const uint8_t* buffer, size_t size)
{
  uint8_t tempBuffer[size];
  memcpy(tempBuffer, buffer, size);
  uint8_t id = tempBuffer[0];
  myPacketSerial.send(id, 1);
}

Why am I not getting anything back?

[PowerBroker2]

This lib seems to be unsupported. A much easier to use and supported serial packet library can be found here. The library also has a Python compatible (and pip-installable) package here.

[bakercp]

It's supported. What problem are you having?

…

On Tue, May 12, 2020, 12:14 PM PB2 ***@***.***> wrote: This lib seems to be unsupported. A much easier to use and supported serial packet library can be found here <https://github.com/PowerBroker2/SerialTransfer>. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACJLRCRIWJ5D5IIXSUNL33RRGGWZANCNFSM4JNAWGTA> .

[bakercp]

By the way, python, with test code is linked in the readme.

…

On Wed, Nov 13, 2019, 12:52 PM Paul (mightyboat) ***@***.***> wrote: I'm trying to send a packet from Python to the Arduino but the handler is never triggered. Maybe I misunderstand the packet format? I'm using the COBS library to encode the data. Here's the packet as it is sent using the standard python serial library: b'\x03\x01\x04\x00' Here's the Arduino code: #include <PacketSerial.h> PacketSerial myPacketSerial; void setup() { myPacketSerial.begin(9600); myPacketSerial.setPacketHandler(&onPacketReceived); } void loop() { myPacketSerial.update(); } void onPacketReceived(const uint8_t* buffer, size_t size) { uint8_t tempBuffer[size]; memcpy(tempBuffer, buffer, size); uint8_t id = tempBuffer[0]; myPacketSerial.send(id, 1); } Why am I not getting anything back? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AACJLRCIOYVKPVIHFIXGBY3QTRLGPA5CNFSM4JNAWGTKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HZDX7FA>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACJLRC3DOLUAQSLSLIID3DQTRLGPANCNFSM4JNAWGTA> .

[bakercp]

@gordon13 One thing of note -- the send method takes a pointer e.g.

void send(const uint8_t* buffer, size_t size) const

and you are giving it a value, thus it may not give the correct value. You may want to try:

...
  uint8_t id = tempBuffer[0];
  myPacketSerial.send(&id, 1);
...

Also, if the value of your id is actually equal to zero, you may be running into this issue: #24

[ranfro]

I'm having the same issue.. I'm sending data and trying to send back data after it is received. It seems onPacketReceived is not firing. Any Ideas?

[socram8888]

FTR I've experienced this issue. Python cobs module will not add the final 00 byte. Add it yourself (packet = cobs.encode(packet) + b'\x00') and it'll work.

[dcheang]

FTR I've experienced this issue. Python cobs module will not add the final 00 byte. Add it yourself (packet = cobs.encode(packet) + b'\x00') and it'll work.

Thank you! This works for me.