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# Test of a ESPnow echo server and client transferring data.
# This test works with ESP32 or ESP8266 as server or client.
# Explicitly tests the irecv(), rev() and recvinto() methods.
try:
import network
import random
import espnow
except ImportError:
print("SKIP")
raise SystemExit
# Set read timeout to 5 seconds
timeout_ms = 5000
default_pmk = b"MicroPyth0nRules"
sync = True
def echo_server(e):
peers = []
while True:
peer, msg = e.irecv(timeout_ms)
if peer is None:
return
if peer not in peers:
peers.append(peer)
e.add_peer(peer)
# Echo the MAC and message back to the sender
if not e.send(peer, msg, sync):
print("ERROR: send() failed to", peer)
return
if msg == b"!done":
return
def client_send(e, peer, msg, sync):
print("TEST: send/recv(msglen=", len(msg), ",sync=", sync, "): ", end="", sep="")
try:
if not e.send(peer, msg, sync):
print("ERROR: Send failed.")
return
except OSError as exc:
# Don't print exc as it is differs for esp32 and esp8266
print("ERROR: OSError:")
return
def init(sta_active=True, ap_active=False):
wlans = [network.WLAN(i) for i in [network.WLAN.IF_STA, network.WLAN.IF_AP]]
e = espnow.ESPNow()
e.active(True)
e.set_pmk(default_pmk)
wlans[0].active(sta_active)
wlans[1].active(ap_active)
wlans[0].disconnect() # Force esp8266 STA interface to disconnect from AP
return e
# Server
def instance0():
e = init(True, False)
multitest.globals(PEERS=[network.WLAN(i).config("mac") for i in (0, 1)])
multitest.next()
print("Server Start")
echo_server(e)
print("Server Done")
e.active(False)
# Client
def instance1():
# Instance 1 (the client)
e = init(True, False)
e.config(timeout_ms=timeout_ms)
multitest.next()
peer = PEERS[0]
e.add_peer(peer)
print("RECVINTO() test...")
msg = bytes([random.getrandbits(8) for _ in range(12)])
client_send(e, peer, msg, True)
data = [bytearray(espnow.ADDR_LEN), bytearray(espnow.MAX_DATA_LEN)]
n = e.recvinto(data)
print("OK" if data[1] == msg else "ERROR: Received != Sent")
print("IRECV() test...")
msg = bytes([random.getrandbits(8) for _ in range(12)])
client_send(e, peer, msg, True)
p2, msg2 = e.irecv()
print("OK" if msg2 == msg else "ERROR: Received != Sent")
print("RECV() test...")
msg = bytes([random.getrandbits(8) for _ in range(12)])
client_send(e, peer, msg, True)
p2, msg2 = e.recv()
print("OK" if msg2 == msg else "ERROR: Received != Sent")
print("ITERATOR() test...")
msg = bytes([random.getrandbits(8) for _ in range(12)])
client_send(e, peer, msg, True)
p2, msg2 = next(e)
print("OK" if msg2 == msg else "ERROR: Received != Sent")
# Tell the server to stop
print("DONE")
msg = b"!done"
client_send(e, peer, msg, True)
p2, msg2 = e.irecv()
print("OK" if msg2 == msg else "ERROR: Received != Sent")
e.active(False)
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